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/deps.py

@@ -1,34 +1,32 @@
-from typing import Generator
-from sqlmodel import Session
-from app.db import engine
+from typing import Annotated, Generator
 
-from typing import Generator, Annotated
-from sqlmodel import Session, select
 from fastapi import Depends, HTTPException, status
 from fastapi.security import OAuth2PasswordBearer
-from jose import jwt, JWTError
+from jose import JWTError, jwt
 from pydantic import ValidationError
+from sqlmodel import Session
 
+from app.config import settings
+from app.core import security
 from app.db import engine
 from app.models.user import User
-from app.core import security
-from app.config import settings
 from app.schemas.token import TokenPayload
 
 oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/login/access-token")
 
+
 def get_session() -> Generator[Session, None, None]:
     with Session(engine) as session:
         yield session
 
+
 SessionDep = Annotated[Session, Depends(get_session)]
 TokenDep = Annotated[str, Depends(oauth2_scheme)]
 
+
 def get_current_user(session: SessionDep, token: TokenDep) -> User:
     try:
-        payload = jwt.decode(
-            token, settings.SECRET_KEY, algorithms=[security.ALGORITHM]
-        )
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[security.ALGORITHM])
         token_data = TokenPayload(**payload)
     except (JWTError, ValidationError):
         raise HTTPException(
@@ -40,4 +38,5 @@ def get_current_user(session: SessionDep, token: TokenDep) -> User:
         raise HTTPException(status_code=404, detail="User not found")
     return user
 
+
 CurrentUser = Annotated[User, Depends(get_current_user)]