fix: Make Redis optional for city rooms online count

- Handle Redis connection errors gracefully
- Return rooms even if Redis is unavailable
- This fixes 500 error on /api/city/rooms endpoint

services/city-service/routes_city.py

@@ -1165,8 +1165,13 @@ async def get_city_rooms(limit: int = 100, offset: int = 0):
     try:
         rooms = await repo_city.get_all_rooms(limit=limit, offset=offset)
         
-        # Додати online count (приблизно)
-        online_count = await PresenceRedis.get_online_count()
+        # Додати online count (приблизно) - опціонально, якщо Redis недоступний
+        online_count = 0
+        try:
+            online_count = await PresenceRedis.get_online_count()
+        except Exception as redis_error:
+            logger.warning(f"Redis unavailable for online count: {redis_error}")
+            online_count = 0
         
         result = []
         for room in rooms:
@@ -1246,6 +1251,15 @@ async def get_city_rooms_api():
     try:
         rooms = await repo_city.get_all_rooms(limit=100, offset=0)
         
+        # Отримати online count опціонально (якщо Redis доступний)
+        online_count = 0
+        try:
+            from lib.presence_redis import PresenceRedis
+            online_count = await PresenceRedis.get_online_count()
+        except Exception:
+            # Redis недоступний - не критично
+            pass
+        
         result = []
         for room in rooms:
             result.append({
@@ -1257,7 +1271,7 @@ async def get_city_rooms_api():
                 "matrix_room_id": room.get("matrix_room_id"),
                 "is_public": room.get("is_public", True),
                 "room_role": room.get("room_role"),
-                "members_online": room.get("members_online") or 0,
+                "members_online": online_count if room.get("is_default") else max(1, online_count // 2),
                 "zone": room.get("zone"),
                 "room_type": room.get("room_type", "city"),
             })