feat: multi-user UI login with admin and monitor roles

Add sac_users table, JWT roles, settings/users API guarded for admin, Users page in UI, and sac_manage_user.py CLI.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/auth/jwt_auth.py

@@ -1,48 +1,70 @@
-from datetime import datetime, timedelta, timezone
-
-from fastapi import Depends, HTTPException, status
-from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
-from jose import JWTError, jwt
-
-from app.config import get_settings
-
-bearer_scheme = HTTPBearer(auto_error=False)
-
-
-def create_access_token(subject: str) -> str:
-    settings = get_settings()
-    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.jwt_expire_minutes)
-    payload = {"sub": subject, "exp": expire}
-    return jwt.encode(payload, settings.jwt_secret, algorithm=settings.jwt_algorithm)
-
-
-def _decode_username(token: str) -> str:
-    settings = get_settings()
-    try:
-        payload = jwt.decode(
-            token,
-            settings.jwt_secret,
-            algorithms=[settings.jwt_algorithm],
-        )
-        username = payload.get("sub")
-        if not username:
-            raise HTTPException(status_code=401, detail="Invalid token")
-        return str(username)
-    except JWTError as exc:
-        raise HTTPException(status_code=401, detail="Invalid token") from exc
-
-
-def verify_access_token(token: str) -> str:
-    """Проверка JWT (в т.ч. query-параметр для SSE)."""
-    return _decode_username(token)
-
-
-def get_current_user(
-    credentials: HTTPAuthorizationCredentials | None = Depends(bearer_scheme),
-) -> str:
-    if credentials is None or credentials.scheme.lower() != "bearer":
-        raise HTTPException(
-            status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Not authenticated",
-        )
-    return _decode_username(credentials.credentials)
+from dataclasses import dataclass
+
+from datetime import datetime, timedelta, timezone
+
+
+
+from fastapi import Depends, HTTPException, status
+
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
+
+from jose import JWTError, jwt
+
+
+
+from app.config import get_settings
+
+from app.models.user import USER_ROLE_ADMIN
+
+
+
+bearer_scheme = HTTPBearer(auto_error=False)
+
+
+
+
+
+@dataclass(frozen=True)
+
+class CurrentUser:
+
+    username: str
+
+    role: str
+
+
+
+    @property
+
+    def is_admin(self) -> bool:
+
+        return self.role == USER_ROLE_ADMIN
+
+
+
+
+
+def create_access_token(subject: str, role: str) -> str:
+
+    settings = get_settings()
+
+    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.jwt_expire_minutes)
+
+    payload = {"sub": subject, "role": role, "exp": expire}
+
+    return jwt.encode(payload, settings.jwt_secret, algorithm=settings.jwt_algorithm)
+
+
+
+
+
+def _decode_current_user(token: str) -> CurrentUser:
+
+    settings = get_settings()
+
+    try:
+
+        payload = jwt.decode(
+
+            token,
+