Create Docker deployment infrastructure

This commit provides production-ready Docker deployment for the HTTP MCP wrapper.

Components:
- Dockerfile: Multi-stage build for optimized image size
  - Builder stage: Compiles dependencies and installs packages
  - Production stage: Minimal runtime image with only necessary files
  - Python 3.11 slim base image
  - Health check endpoint integration
  - Proper Python environment variables (unbuffered, no bytecode)

- docker-compose.yml: Complete orchestration setup
  - Service configuration with restart policy
  - Port mapping (8000:8000)
  - Environment variable passthrough
  - Health check configuration
  - Isolated network
  - Ready for production deployment

- .dockerignore: Optimized build context
  - Excludes Python cache, virtual environments, IDE files
  - Excludes tests and documentation
  - Reduces image size and build time

- .env.docker.example: Docker-specific environment template
  - All required Gitea configuration
  - Optional authentication settings
  - Optional tool filtering settings

Deployment:
1. Copy .env.docker.example to .env
2. Fill in Gitea credentials
3. Run: docker-compose up -d
4. Access at http://localhost:8000

This infrastructure enables easy deployment to any Docker-compatible environment (local, cloud, Kubernetes).

Closes #15

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

.dockerignore

@@ -0,0 +1,67 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+*.coverage
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+
+# Virtual environments
+venv/
+env/
+ENV/
+.venv/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Git
+.git/
+.gitignore
+.gitattributes
+
+# Documentation
+*.md
+docs/
+
+# CI/CD
+.github/
+.gitlab-ci.yml
+
+# Environment files
+.env
+.env.*
+!.env.example
+
+# Claude Code
+.claude/
+
+# Docker
+.dockerignore
+docker-compose.override.yml
+
+# Test files
+tests/