docs: remove Android auto-update page and refresh Core component docs (#85)

- Remove Android auto-update page from docs, en i18n, and zh-Hans i18n
- Remove Android auto-update from sidebar navigation
- Update GeneralUpdate.Core.md to reflect latest source code (v10.5.0-beta.2):
  - Add multi-target framework info (netstandard2.0; net8.0; net10.0)
  - Add AOT/Trim compatibility and JSON source generator details
  - Document AuthScheme enum (Hmac/Bearer/ApiKey/Basic) and new config fields
  - Add cross-platform strategy scenario (Windows/Linux/Mac)
  - Add new feature entries (multi-auth, file tree diff, Environments IPC)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: JusterZhu