feat: Fix nutrition service and add location-based alerts

Changes:
- Fix nutrition service: add is_active column and Pydantic validation for UUID/datetime
- Add location-based alerts feature: users can now see alerts within 1km radius
- Fix CORS and response serialization in nutrition service
- Add getCurrentLocation() and loadAlertsNearby() functions
- Improve UI for nearby alerts display with distance and response count

services/nutrition_service/schemas.py

@@ -1,8 +1,9 @@
 from datetime import date
 from enum import Enum
 from typing import List, Optional
+from uuid import UUID
 
-from pydantic import BaseModel, Field, root_validator
+from pydantic import BaseModel, Field, root_validator, field_serializer
 
 
 class MealType(str, Enum):
@@ -99,6 +100,7 @@ class UserNutritionEntryResponse(UserNutritionEntryBase):
     fat_grams: Optional[float] = None
     carbs_grams: Optional[float] = None
     created_at: str
+    updated_at: Optional[str] = None
 
     class Config:
         from_attributes = True