feat: scaffold gitea-mcp package with module rename

- Copied source from leo-claude-mktplace/mcp-servers/gitea/ v1.0.0
- Renamed module: mcp_server → gitea_mcp (all imports updated)
- Created pyproject.toml for standalone package identity
- Preserved all existing tools and test suite
- MCP SDK imports unchanged

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

.gitignore

@@ -0,0 +1,12 @@
+__pycache__/
+*.pyc
+*.pyo
+*.egg-info/
+dist/
+build/
+.venv/
+.env
+*.egg
+.pytest_cache/
+.coverage
+htmlcov/