Refactor Google Meet Transcripts Extension for Local Use

- Removed all cloud-related functionalities, including login prompts and token handling.
- Disabled Laxis cloud features, ensuring no data is sent to external servers.
- Updated manifest to reflect the new local-only functionality.
- Added a new Python server to handle transcripts locally, including WebSocket support.
- Implemented storage management for transcripts, including deduplication and file writing.
- Created a smoke test for the WebSocket server to simulate transcript updates.
- Updated README with setup instructions and usage details for the new local server.

meet-transcripts/_smoke_test.py

@@ -0,0 +1,37 @@
+"""تست سریع بدون Chrome: شبیه‌سازی چیزی که افزونه می‌فرستد (با startedAt/endedAt).
+
+اول سرور را بالا بیاور:  python ws_server.py
+بعد:                      python _smoke_test.py
+باید PONG + چند ACK بگیری و فایل‌های transcripts/meeting-abc123.{srt,txt,json} ساخته شوند.
+"""
+import asyncio
+import json
+import websockets
+
+
+async def main():
+    base = 1_700_000_000_000  # epoch ms
+    async with websockets.connect("ws://127.0.0.1:8765") as ws:
+        await ws.send(json.dumps({"type": "PING", "ts": 1}))
+        print("PONG:", await ws.recv())
+
+        # حرف ۱: سه snapshotِ روبه‌رشد با startedAt ثابت → باید در یک segment جمع شوند
+        for end, txt in [(1200, "سلام"), (2600, "سلام به همه"), (4000, "سلام به همه خوش آمدید")]:
+            await ws.send(json.dumps({
+                "type": "TRANSCRIPT_UPDATE", "sessionId": "meeting-abc123",
+                "speaker": "Arash", "text": txt,
+                "startedAt": base, "endedAt": base + end,
+            }))
+            print("ACK:", await ws.recv())
+
+        # حرف ۲: speaker دیگر، startedAt جدید
+        for end, txt in [(7000, "ممنون"), (8500, "ممنون از دعوت")]:
+            await ws.send(json.dumps({
+                "type": "TRANSCRIPT_UPDATE", "sessionId": "meeting-abc123",
+                "speaker": "Vahid", "text": txt,
+                "startedAt": base + 6000, "endedAt": base + end,
+            }))
+            print("ACK:", await ws.recv())
+
+
+asyncio.run(main())