Add AI-powered nutrition and plan modules

Introduces DSPy-based nutrition and plan generation modules, including image analysis for nutritional info and personalized diet/exercise plans. Adds new API endpoints for health metrics/goals, nutrition image analysis, and plan management. Updates models, schemas, and backend structure to support these features, and includes initial training data and configuration for prompt optimization.

backend/app/api/v1/endpoints/users.py

@@ -1,4 +1,5 @@
 from typing import Any
+
 from fastapi import APIRouter, Depends, HTTPException
 from sqlmodel import Session, select
 
@@ -9,6 +10,7 @@ from app.schemas.user import UserCreate, UserRead
 
 router = APIRouter()
 
+
 @router.post("/", response_model=UserRead)
 def create_user(
     *,
@@ -24,7 +26,7 @@ def create_user(
             status_code=400,
             detail="The user with this email already exists in the system",
         )
-    
+
     user = User(
         email=user_in.email,
         username=user_in.username,