Clean Core security audit findings

src/govoplan_core/api/v1/schemas.py

@@ -201,7 +201,7 @@ class AuthGroupsResponse(BaseModel):
 
 class LoginResponse(BaseModel):
     access_token: str
-    token_type: str = "bearer"
+    token_type: str = "bearer"  # noqa: S105 - OAuth token type, not a credential.
     expires_at: datetime
     user: UserInfo
     # Backwards-compatible alias for the active tenant.