Implement list_workspaces and list_conversations commands to enable
frontend access to workspace and conversation data via Tauri IPC.
- Add workspace.rs with list_workspaces command (GET /workspaces)
- Add conversation.rs with list_conversations command (GET /conversations?workspace_id=)
- Register both commands in lib.rs invoke_handler
- Update commands/mod.rs to expose new modules
MDietermann
7c2e5ca9a9