feat: Add Docker infrastructure with Caddy and startup scripts (#25, #26)

Issue #25 - Docker multi-service infrastructure:
- Create docker/Dockerfile with multi-stage build, git support, port 8080
- Create docker/docker-compose.yml with app + Caddy services
- Create docker/Caddyfile for HTTPS termination and reverse proxy
- Create docker/.env.example with configuration template

Issue #26 - Startup scripts and tests:
- Create scripts/start.sh for production startup with env validation
- Create scripts/healthcheck.sh for Docker health checks
- Add health endpoint tests to test_mcp_endpoints.py
- Fix middleware order (HealthCheckBypass must wrap BearerAuth)
- Fix pyproject.toml testpaths to use 'tests' directory
- Update test_config.py for new defaults (0.0.0.0:8080)

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

src/gitea_mcp_remote/server_http.py

@@ -135,10 +135,11 @@ def create_app():
 
     app = Starlette(routes=routes)
 
-    # Apply middleware (order matters - health bypass first)
-    app = HealthCheckBypassMiddleware(app)
+    # Apply middleware (order matters - outermost runs first)
+    # HealthCheckBypass must wrap BearerAuth so it sets skip_auth flag first
     if settings.auth_token:
-        app = BearerAuthMiddleware(app, token=settings.auth_token)
+        app = BearerAuthMiddleware(app, auth_token=settings.auth_token)
+    app = HealthCheckBypassMiddleware(app)
 
     return app