feat: Add SQLite database support and fixed portable extraction path

- Add SQLite as alternative database for offline/firewall environments
- Add --database-type parameter to build-client.bat (mysql/sqlite)
- Refactor database.py to support both MySQL and SQLite
- Add DB_TYPE and SQLITE_PATH configuration options
- Set fixed unpackDirName for portable exe (Meeting-Assistant)
- Update DEPLOYMENT.md with SQLite mode documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

client/config.json

@@ -12,6 +12,8 @@
     "host": "127.0.0.1",
     "port": 8000,
     "database": {
+      "type": "mysql",
+      "sqlitePath": "data/meeting.db",
       "host": "mysql.theaken.com",
       "port": 33306,
       "user": "A060",