refactor: Rename package to gitea_mcp_remote and update configuration

Issue #19 - Foundation for Sprint 01: Core Architecture Correction

Changes:
- Renamed package directory: gitea_http_wrapper -> gitea_mcp_remote
- Updated config/settings.py:
  - Made gitea_repo optional (allow None)
  - Added mcp_auth_mode field (default: "optional")
  - Changed HTTP defaults: 0.0.0.0:8080 (was 127.0.0.1:8000)
  - Removed get_gitea_mcp_env() method (no longer needed)
- Updated all import paths throughout codebase
- Updated filtering/filter.py: Changed ValueError to warning when both
  enabled_tools and disabled_tools are specified
- Updated test files with new import paths
- Updated test_filtering.py to test warning instead of ValueError
- Updated pyproject.toml, pytest.ini, and README.md references

All modules preserved - only import paths and configuration updated.

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

pytest.ini

@@ -1,5 +1,5 @@
 [pytest]
-testpaths = src/gitea_http_wrapper/tests
+testpaths = src/gitea_mcp_remote/tests
 python_files = test_*.py
 python_classes = Test*
 python_functions = test_*