feat(platform): add audit logs and activity feed

backend/hermes/app/schemas/api_response.py

@@ -0,0 +1,16 @@
+from typing import Any
+
+from pydantic import BaseModel, Field
+
+
+class ApiSuccess(BaseModel):
+    success: bool = True
+    data: Any = None
+    message: str = ""
+
+
+class ApiError(BaseModel):
+    success: bool = False
+    message: str
+    error_code: str
+    details: list[Any] = Field(default_factory=list)