feat(edit_tool): remote session import, async ASR, disclaimer

- server.py: import from remote session URL (download + audio conversion)
- server.py: async ASR via background thread + polling API
- server.py: ThreadedHTTPServer for concurrent requests
- server.py: support both Apache dir listing and Session Viewer HTML formats
- server.py: .env for API credentials (gitignored)
- index.html (editor): import modal + ASR polling auto-fill user_text
- index.html (demo): footer disclaimer for voice cloning demos
- data.json: add meta.disclaimer (zh/en)
- .gitignore: exclude .env

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

Author: sunweiyue

.gitignore

@@ -1,2 +1,3 @@
 .DS_Store
-develop/advice/
+develop/advice/
+develop/edit_tool/.env