RegWatch backend : FastAPI + Postgres partagé + Docker/CI homelab

- SECRET_KEY et DATABASE_URL externalisés (Vault -> env), plus de secret en dur
- SQLite -> postgres-shared (psycopg2), schéma créé au boot (entrypoint.sh)
- Dockerfile + docker-compose (Watchtower) + .gitea/workflows/build.yml

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

api/auth.py

@@ -0,0 +1,61 @@
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+import os
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from pydantic import BaseModel
+
+# Secret JWT injecté par l'env (Vault -> .env). Repli dev uniquement ; en prod SECRET_KEY est obligatoire.
+SECRET_KEY = os.getenv("SECRET_KEY", "dev-only-insecure-secret-change-me")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "30"))
+
+pwd_context = CryptContext(schemes=["argon2"], deprecated="auto")
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+class TokenData(BaseModel):
+    email: Optional[str] = None
+
+class UserLogin(BaseModel):
+    email: str
+    password: str
+
+class UserCreate(BaseModel):
+    email: str
+    password: str
+    full_name: Optional[str] = None
+
+class UserResponse(BaseModel):
+    id: int
+    email: str
+    full_name: Optional[str] = None
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.now(timezone.utc) + expires_delta
+    else:
+        expire = datetime.now(timezone.utc) + timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+def decode_token(token: str) -> Optional[str]:
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        email: str = payload.get("sub")
+        if email is None:
+            return None
+        return email
+    except JWTError:
+        return None
+