chore: refresh deps and adjust share rate limits

- Raise index and file-serving limits to 20 requests per minute.
- Keep hourly file-serving allowance at 500 requests.
- Increase the index hourly allowance to 500 requests.
- Update the my_helpers submodule pointer.
- Refresh uv.lock for current dependency releases.

routes/side/main.py

@@ -32,7 +32,7 @@ def build_share_url(file_id: str) -> str:
   return f"{scheme}://{host}{root_path}/-{file_id}"
 
 @side_main_bp.route('/')
-@LIMITER.limit("10 per minute;50 per hour")
+@LIMITER.limit("20 per minute;500 per hour;")
 async def index():
   if session.get("user") is not None:
     return await render_template("views/webpage/files/upload.htm")
@@ -130,7 +130,7 @@ async def file_delete_api(file_id, user):
   return jsonify({"ok": True})
 
 @side_main_bp.route("/-<file_id>")
-@LIMITER.limit("10 per minute;500 per hour;")
+@LIMITER.limit("20 per minute;500 per hour;")
 async def serve_file(file_id: str):
   add_wide_event_context(nanoshare={"operation": "serve_file", "file_id": file_id})
   file_data = await current_app.convex.get_file(file_id=file_id)