Feat: Rechnungsadresse — Profil, Upgrade-Modal Hinweis, Rechnung-erstellen-Button in Upgrade-Cards (SW by-v967)

backend/routes/profile.py

@@ -28,6 +28,7 @@ class ProfileUpdate(BaseModel):
     notes_ki_enabled:     Optional[int] = None
     gassi_stunde_push:    Optional[int] = None
     preferred_theme:      Optional[str] = None
+    billing_address:      Optional[str] = None
 
 
 def _load_user(user_id: int) -> dict:
@@ -35,7 +36,7 @@ def _load_user(user_id: int) -> dict:
         row = conn.execute(
             """SELECT id, name, real_name, email, rolle, is_premium, email_verified,
                       bio, wohnort, erfahrung, social_link,
-                      profil_sichtbarkeit, avatar_url, created_at
+                      profil_sichtbarkeit, avatar_url, created_at, billing_address
                FROM users WHERE id=?""",
             (user_id,)
         ).fetchone()