Fix setup router: use explicit full paths instead of empty prefix route

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/routers/setup.py

@@ -7,7 +7,7 @@ from ..dependencies import get_db
 from ..models.user import User
 from ..services.auth import hash_password, create_token
 
-router = APIRouter(prefix="/api/setup", tags=["setup"])
+router = APIRouter(tags=["setup"])
 
 
 class SetupRequest(BaseModel):
@@ -16,14 +16,14 @@ class SetupRequest(BaseModel):
     email: str = ""
 
 
-@router.get("/status")
+@router.get("/api/setup/status")
 async def setup_status(db: AsyncSession = Depends(get_db)):
     result = await db.execute(select(func.count()).select_from(User))
     count = result.scalar()
     return {"needsSetup": count == 0}
 
 
-@router.post("")
+@router.post("/api/setup")
 async def run_setup(body: SetupRequest, db: AsyncSession = Depends(get_db)):
     result = await db.execute(select(func.count()).select_from(User))
     if result.scalar() > 0: