Web: Mindestbestand je Lagerort + Einkaufsliste je Ort

- Neuer LocationMinStock-Editor (Zeilen: Lagerort + Menge, separat speichern).
- Produktformular: Abschnitt „Mindestbestand je Lagerort" (Menge in Artikel-
  einheit), zusaetzlich zum Gesamt-Mindestbestand.
- Gruppen: je Gruppe ein Editor „Mindestbestand je Lagerort".
- Einkaufsliste: Abschnitt „Bedarf: <Lagerort>" mit Produkten und Gruppen, die
  am Ort unter dem dort hinterlegten Mindestbestand liegen.
- API-Methoden set*LocationMinStock und shoppingByLocation.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/api.js

@@ -185,9 +185,16 @@ export const api = {
   updateLot: (id, body) => request(`/lots/${id}`, { method: "PATCH", body }),
   deleteLot: (id) => request(`/lots/${id}`, { method: "DELETE" }),
 
+  // Mindestbestand je Lagerort (ersetzt jeweils die komplette Liste).
+  setProductLocationMinStock: (id, list) =>
+    request(`/products/${id}/location-min-stock`, { method: "PUT", body: list }),
+  setGroupLocationMinStock: (id, list) =>
+    request(`/groups/${id}/location-min-stock`, { method: "PUT", body: list }),
+
   // Views
   shoppingList: () => request("/shopping-list"),
   groupShoppingList: () => request("/shopping-list/groups"),
+  shoppingByLocation: () => request("/shopping-list/by-location"),
   expiring: (days) => request(`/expiring${days != null ? `?days=${days}` : ""}`),
   listMovements: (limit) => request(`/movements${limit ? `?limit=${limit}` : ""}`),
 

web/src/components/LocationMinStock.jsx

@@ -0,0 +1,85 @@
+import { useState } from "react";
+import Icon from "./Icon";
+
+/**
+ * Editor für Mindestbestände je Lagerort (Bedarfe). Eine Zeile je Ort mit Menge;
+ * „Bedarfe speichern" ersetzt über onSave die komplette Liste. Menge 0/leer =
+ * Ort fällt weg.
+ */
+export default function LocationMinStock({ locations, initial = [], unitLabel = "", onSave, onError }) {
+  const [rows, setRows] = useState(() =>
+    initial.map((e) => ({ location_id: String(e.location_id), min_stock: String(e.min_stock) })),
+  );
+  const [busy, setBusy] = useState(false);
+  const [ok, setOk] = useState(false);
+
+  const used = new Set(rows.map((r) => r.location_id));
+  const frei = locations.filter((l) => !used.has(String(l.id)));
+
+  function addRow() {
+    if (!frei.length) return;
+    setRows([...rows, { location_id: String(frei[0].id), min_stock: "" }]);
+    setOk(false);
+  }
+  function setRow(i, patch) {
+    setRows(rows.map((r, j) => (j === i ? { ...r, ...patch } : r)));
+    setOk(false);
+  }
+  function removeRow(i) {
+    setRows(rows.filter((_, j) => j !== i));
+    setOk(false);
+  }
+
+  async function save() {
+    setBusy(true);
+    try {
+      const list = rows
+        .filter((r) => r.location_id !== "" && Number(r.min_stock) > 0)
+        .map((r) => ({ location_id: Number(r.location_id), min_stock: Number(r.min_stock) }));
+      await onSave(list);
+      setOk(true);
+    } catch (err) {
+      onError?.(err.message);
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  if (!locations.length) {
+    return <p className="muted small mt-0">Erst Lagerorte anlegen, dann Bedarfe je Ort möglich.</p>;
+  }
+
+  return (
+    <div className="stack">
+      {rows.length === 0 && (
+        <p className="muted small mt-0">Kein Bedarf je Lagerort festgelegt.</p>
+      )}
+      {rows.map((r, i) => (
+        <div className="field-inline" key={i} style={{ marginBottom: 0 }}>
+          <label className="grow" style={{ flex: "1 1 auto", minWidth: 0, margin: 0 }}>
+            <select value={r.location_id} onChange={(e) => setRow(i, { location_id: e.target.value })}>
+              {locations.map((l) => <option key={l.id} value={l.id}>{l.name}</option>)}
+            </select>
+          </label>
+          <label style={{ margin: 0, width: 130 }}>
+            <input type="number" min="0" step="0.01" placeholder="Menge" value={r.min_stock}
+              onChange={(e) => setRow(i, { min_stock: e.target.value })} />
+          </label>
+          {unitLabel && <span className="muted small" style={{ alignSelf: "center" }}>{unitLabel}</span>}
+          <button type="button" className="btn-icon danger" onClick={() => removeRow(i)} title="Entfernen">
+            <Icon name="trash" size={16} />
+          </button>
+        </div>
+      ))}
+      <div className="field-inline" style={{ marginBottom: 0 }}>
+        <button type="button" className="btn" onClick={addRow} disabled={!frei.length}>
+          <Icon name="plus" size={16} />Lagerort
+        </button>
+        <button type="button" className="btn primary" onClick={save} disabled={busy}>
+          <Icon name="check" size={16} />{busy ? "Speichern…" : "Bedarfe speichern"}
+        </button>
+        {ok && <span className="muted small" style={{ alignSelf: "center" }}>Gespeichert.</span>}
+      </div>
+    </div>
+  );
+}

web/src/pages/Groups.jsx

@@ -4,6 +4,7 @@ import { useConfirm } from "../confirm";
 import { useAuth } from "../auth";
 import BarcodeList from "../components/BarcodeList";
 import Icon from "../components/Icon";
+import LocationMinStock from "../components/LocationMinStock";
 import { fmt } from "../units";
 
 export default function Groups() {
@@ -11,15 +12,19 @@ export default function Groups() {
   const { isAdmin } = useAuth();
   const [groups, setGroups] = useState([]);
   const [units, setUnits] = useState([]);
+  const [locations, setLocations] = useState([]);
   const [form, setForm] = useState({ name: "", min_stock: "", min_stock_unit_id: "" });
   const [selectedId, setSelectedId] = useState(null);
   const [error, setError] = useState(null);
 
   async function load() {
     try {
-      const [gs, us] = await Promise.all([api.listGroups(), api.listUnits()]);
+      const [gs, us, ls] = await Promise.all([
+        api.listGroups(), api.listUnits(), api.listLocations(),
+      ]);
       setGroups(gs);
       setUnits(us);
+      setLocations(ls);
     } catch (err) {
       setError(err.message);
     }
@@ -204,6 +209,30 @@ export default function Groups() {
             </section>
           )}
 
+          {selected && isAdmin && (
+            <section className="card">
+              <div className="card-head">
+                <Icon name="location" />
+                <h2>Mindestbestand je Lagerort</h2>
+              </div>
+              <p className="muted small mt-0">
+                Bedarf dieser Gruppe je Lagerort (z.B. Ferienhaus, Zuhause), zusätzlich zum
+                Gesamt-Mindestbestand{selected.min_stock_unit_name ? ` (in ${selected.min_stock_unit_name})` : ""}.
+              </p>
+              <LocationMinStock
+                key={selected.id}
+                locations={locations}
+                initial={selected.location_min_stocks || []}
+                unitLabel={selected.min_stock_unit_name || ""}
+                onError={setError}
+                onSave={async (list) => {
+                  await api.setGroupLocationMinStock(selected.id, list);
+                  await load();
+                }}
+              />
+            </section>
+          )}
+
           {isAdmin && (
             <form className="card" onSubmit={add}>
               <div className="card-head"><Icon name="tag" /><h2>Neue Gruppe</h2></div>

web/src/pages/ProductForm.jsx

@@ -11,6 +11,7 @@ import { useToast } from "../toast";
 import { useSettings } from "../settings";
 import { asTree } from "../categoryTree";
 import CategorySelect from "../components/CategorySelect";
+import LocationMinStock from "../components/LocationMinStock";
 import { DynamicFields, FIELD_TYPES } from "../fields";
 import ObjektBestand from "../components/ObjektBestand";
 import Einzelstuecke from "../components/Einzelstuecke";
@@ -675,6 +676,31 @@ export default function ProductForm() {
               </select>
             </label>
           </div>
+
+          {!isNew && product && isAdmin && (
+            <div style={{ marginTop: "var(--sp-2)" }}>
+              <div className="card-head" style={{ marginBottom: "var(--sp-1)" }}>
+                <Icon name="location" size={16} />
+                <h3 style={{ margin: 0 }}>Mindestbestand je Lagerort</h3>
+              </div>
+              <p className="muted small mt-0">
+                Zusätzlich zum Gesamt-Mindestbestand: eigener Bedarf je Lagerort (z.B.
+                Ferienhaus, Zuhause). Menge in {product.package_label || product.unit_name || "Stück"}.
+                Wird separat gespeichert.
+              </p>
+              <LocationMinStock
+                locations={locations}
+                initial={product.location_min_stocks || []}
+                unitLabel={product.package_label || product.unit_name || "Stück"}
+                onError={(m) => toast(m, "warn")}
+                onSave={async (list) => {
+                  const updated = await api.setProductLocationMinStock(product.id, list);
+                  setProduct(updated);
+                  toast("Bedarfe je Lagerort gespeichert.");
+                }}
+              />
+            </div>
+          )}
           </>)}
           <div className="row">
             <label className="grow seg-label">

web/src/pages/ShoppingList.jsx

@@ -6,12 +6,13 @@ import { amountText, fmt, unitShort } from "../units";
 export default function ShoppingList() {
   const [items, setItems] = useState([]);
   const [groups, setGroups] = useState([]);
+  const [byLocation, setByLocation] = useState([]);
   const [checked, setChecked] = useState({});
   const [error, setError] = useState(null);
 
   useEffect(() => {
-    Promise.all([api.shoppingList(), api.groupShoppingList()])
-      .then(([p, g]) => { setItems(p); setGroups(g); })
+    Promise.all([api.shoppingList(), api.groupShoppingList(), api.shoppingByLocation()])
+      .then(([p, g, l]) => { setItems(p); setGroups(g); setByLocation(l); })
       .catch((e) => setError(e.message));
   }, []);
 
@@ -31,6 +32,10 @@ export default function ShoppingList() {
       </div>
       {error && <div className="alert error"><Icon name="alert" size={16} />{error}</div>}
 
+      {byLocation.length > 0 && (
+        <div className="sub" style={{ marginBottom: "var(--sp-2)" }}>Gesamt</div>
+      )}
+
       <div className="card">
         {empty ? (
           <div className="empty">Alle Mindestbestände erreicht.</div>
@@ -70,6 +75,50 @@ export default function ShoppingList() {
           </ul>
         )}
       </div>
+
+      {byLocation.map((loc) => (
+        <div key={loc.location_id} style={{ marginTop: "var(--sp-4)" }}>
+          <div className="sub" style={{ marginBottom: "var(--sp-2)" }}>
+            <Icon name="location" size={14} /> Bedarf: {loc.location_name}
+          </div>
+          <div className="card">
+            <ul className="checklist">
+              {loc.groups.map((it) => {
+                const key = `l${loc.location_id}g${it.group_id}`;
+                return (
+                  <li key={key} className={checked[key] ? "done" : ""}>
+                    <label>
+                      <input type="checkbox" checked={!!checked[key]} onChange={(e) => toggle(key, e.target.checked)} />
+                      <span className="badge accent">Gruppe</span>
+                      <span className="item-name">{it.name}</span>
+                    </label>
+                    <span className="muted small">
+                      fehlt <strong>{fmt(it.deficit)} {it.unit_name}</strong>{" "}
+                      (Bestand {fmt(it.stock)} / min {fmt(it.min_stock)})
+                    </span>
+                  </li>
+                );
+              })}
+              {loc.products.map((it) => {
+                const key = `l${loc.location_id}p${it.product_id}`;
+                return (
+                  <li key={key} className={checked[key] ? "done" : ""}>
+                    <label>
+                      <input type="checkbox" checked={!!checked[key]} onChange={(e) => toggle(key, e.target.checked)} />
+                      <span className="item-name">{it.name}</span>
+                    </label>
+                    <span className="muted small">
+                      fehlt <strong>{fmt(it.deficit)} {it.unit_label}</strong>{" "}
+                      (Bestand {fmt(it.stock)} / min {fmt(it.min_stock)})
+                    </span>
+                  </li>
+                );
+              })}
+            </ul>
+          </div>
+        </div>
+      ))}
+
       <p className="muted small">
         Das Abhaken hilft beim Einkaufen und wird (noch) nicht dauerhaft gespeichert.
       </p>