feat: chat folders, attachments, treeview backend - migration, models, routes

app/plugins/builtins/ai_assistant/services.py

@@ -19,6 +19,8 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.core.permissions import check_permission
 from app.plugins.builtins.ai_assistant.models import (
     AIAgent,
+    AIChatAttachment,
+    AIChatFolder,
     AIChatMessage,
     AIChatSession,
     AIModel,
@@ -113,6 +115,7 @@ def session_to_response(session: AIChatSession) -> dict[str, Any]:
         "title": session.title,
         "is_pinned": session.is_pinned,
         "is_sidebar": session.is_sidebar,
+        "folder_id": str(session.folder_id) if hasattr(session, 'folder_id') and session.folder_id else None,
         "created_at": session.created_at.isoformat() if session.created_at else None,
         "updated_at": session.updated_at.isoformat() if session.updated_at else None,
     }
@@ -132,6 +135,27 @@ def message_to_response(msg: AIChatMessage) -> dict[str, Any]:
     }
 
 
+def folder_to_response(folder: AIChatFolder) -> dict[str, Any]:
+    return {
+        "id": str(folder.id),
+        "name": folder.name,
+        "parent_id": str(folder.parent_id) if folder.parent_id else None,
+        "user_id": str(folder.user_id),
+        "created_at": folder.created_at.isoformat() if folder.created_at else None,
+    }
+
+
+def attachment_to_response(att: AIChatAttachment) -> dict[str, Any]:
+    return {
+        "id": str(att.id),
+        "message_id": str(att.message_id) if att.message_id else None,
+        "session_id": str(att.session_id),
+        "filename": att.filename,
+        "mime_type": att.mime_type,
+        "size_bytes": att.size_bytes,
+    }
+
+
 # ─── Provider/Model/Preset/Agent CRUD ───
 
 async def get_default_provider(db: AsyncSession, tenant_id: uuid.UUID) -> AIProvider | None: