Feature: UX-Fixes — Zahnrad weg, POI-Kombi-Typen, exp-fab-Position, Welten-Config in DB (SW by-v653)

- worlds-settings Zahnrad komplett entfernt (war auf Mobile sichtbar, auf Desktop schon hidden)
- exp-fab: bottom jetzt calc(--nav-bottom-height + --safe-bottom + --space-2) — kein Overlap mit worlds-back auf iPhone
- Karte POI: neue Typen bank, bank_kotbeutel, bank_kotbeutel_abfall, kotbeutel_abfall (Backend + Frontend)
- Welten-Chip-Config: GET/PUT /profile/world-config, Spalte users.world_config TEXT (Migration), Sync bei Init + Speichern

backend/routes/profile.py

@@ -113,3 +113,28 @@ async def upload_avatar(
         )
 
     return {"avatar_url": avatar_url}
+
+
+# ----------------------------------------------------------
+# GET /profile/world-config  —  Welten-Chip-Konfiguration laden
+# PUT /profile/world-config  —  Welten-Chip-Konfiguration speichern
+# ----------------------------------------------------------
+import json as _json
+
+@router.get('/profile/world-config')
+async def get_world_config(user=Depends(get_current_user)):
+    with db() as conn:
+        row = conn.execute("SELECT world_config FROM users WHERE id=?", (user['id'],)).fetchone()
+    cfg = row['world_config'] if row and row['world_config'] else None
+    return {"config": _json.loads(cfg) if cfg else None}
+
+
+class WorldConfigIn(BaseModel):
+    config: dict
+
+@router.put('/profile/world-config')
+async def put_world_config(body: WorldConfigIn, user=Depends(get_current_user)):
+    with db() as conn:
+        conn.execute("UPDATE users SET world_config=? WHERE id=?",
+                     (_json.dumps(body.config), user['id']))
+    return {"status": "ok"}