feat(F.16): Gitea plugin review, test & public release — v3.6.0

- Added update_webhook and delete_label tools (58 total Gitea tools)
- 97 unit tests (test_gitea_plugin.py)
- Gitea now public for all users (DEFAULT_PUBLIC_PLUGINS)
- Fixed merge_pull_request optional field handling

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mcphub-server"
-version = "3.5.0"
+version = "3.6.0"
 description = "AI-native management hub for WordPress, WooCommerce, and self-hosted services via Model Context Protocol (MCP)"
 authors = [
     {name = "MCP Hub", email = "contact@mcphub.dev"}