feat(gitea): migrate to published gitea-mcp package from Gitea PyPI

mcp-servers/gitea/ thinned to venv wrapper — source code removed,
package installed from registry. run.sh updated from mcp_server.server
to gitea_mcp.server. requirements.txt points to Gitea PyPI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

mcp-servers/gitea/requirements.txt

@@ -1,6 +1,2 @@
-mcp>=0.9.0               # MCP SDK from Anthropic
-python-dotenv>=1.0.0     # Environment variable loading
-requests>=2.31.0         # HTTP client for Gitea API
-pydantic>=2.5.0          # Data validation
-pytest>=7.4.3            # Testing framework
-pytest-asyncio>=0.23.0   # Async testing support
+--extra-index-url https://gitea.hotserv.cloud/api/packages/personal-projects/pypi/simple
+gitea-mcp>=1.0.0