Fix: Admin Züchter-Tab — Alle Züchter Liste + Antraege-Section (SW by-v921)

- GET /api/admin/breeders: neuer Endpunkt listet alle aktiven Züchter
  mit Zwingername, Rasse, Stadt, Würfe/Zuchthunde-Zähler, subscription_tier
- _renderZuechter: zwei Sektionen parallel geladen
  - "Offene Anträge" (wie vorher, aber mit Section-Header auch wenn leer)
  - "Alle Züchter": Tabelle analog Nutzer-Tab mit Abo-Button → _changeTier
- api.js: API.breeder.allList() hinzugefügt
- SW by-v921, APP_VER 921

backend/routes/breeder.py

@@ -183,6 +183,27 @@ async def admin_pending_breeders(admin=Depends(require_admin)):
     return [dict(r) for r in rows]
 
 
+# ------------------------------------------------------------------
+# GET /api/admin/breeders — alle aktiven Züchter
+# ------------------------------------------------------------------
+@router.get("/admin/breeders")
+async def admin_all_breeders(admin=Depends(require_admin)):
+    with db() as conn:
+        rows = conn.execute("""
+            SELECT u.id, u.name, u.email, u.created_at, u.subscription_tier,
+                   u.breeder_status, u.last_login,
+                   bp.zwingername, bp.rasse_text, bp.verein, bp.vdh_mitglied,
+                   bp.stadt, bp.website, bp.verified_at,
+                   (SELECT COUNT(*) FROM litters WHERE user_id=u.id) AS wuerfe_count,
+                   (SELECT COUNT(*) FROM dogs WHERE user_id=u.id AND is_zucht_hund=1) AS zuchthunde_count
+            FROM users u
+            LEFT JOIN breeder_profiles bp ON bp.user_id = u.id
+            WHERE u.rolle = 'breeder' OR u.breeder_status = 'approved'
+            ORDER BY bp.verified_at DESC NULLS LAST, u.created_at DESC
+        """).fetchall()
+    return [dict(r) for r in rows]
+
+
 # ------------------------------------------------------------------
 # GET /api/admin/breeder/{user_id}/documents — Dokumente eines Antrags
 # ------------------------------------------------------------------