refactor: translate all docstrings and comments to English (STRICT ENGLISH POLICY complete)

backend/auth.py

@@ -1,6 +1,6 @@
 """
 [C-01] JWT Authentication Module
-Implementare Bearer token authentication pentru API endpoints.
+Implement Bearer token authentication for API endpoints.
 """
 import os
 from datetime import datetime, timedelta, timezone
@@ -13,7 +13,7 @@ from pydantic import BaseModel
 # Configuration
 SECRET_KEY = os.environ.get("JWT_SECRET_KEY")
 if not SECRET_KEY:
-    # Genereaza o cheie de fallback pentru dev (NU PENTRU PRODUCȚIE)
+    # Generate fallback key for dev (NOT FOR PRODUCTION)
     import secrets
     SECRET_KEY = secrets.token_urlsafe(32)
     import sys
@@ -60,8 +60,8 @@ def create_access_token(user_id: int, username: str, role: str, expires_delta: O
 
 async def get_current_user(credentials: HTTPAuthCredentials = Depends(security)):
     """
-    Dependency que valideaza JWT token din Authorization header.
-    Returneaza TokenData cu user_id, username, role.
+    Dependency that validates JWT token from Authorization header.
+    Returns TokenData with user_id, username, role.
     """
     token = credentials.credentials
     try:
@@ -91,7 +91,7 @@ async def get_current_user(credentials: HTTPAuthCredentials = Depends(security))
 
 
 async def get_current_admin(current_user: TokenData = Depends(get_current_user)):
-    """Dependency que verifica daca user-ul are rol 'admin'."""
+    """Dependency that checks if user has 'admin' role."""
     if current_user.role != "admin":
         raise HTTPException(
             status_code=status.HTTP_403_FORBIDDEN,