feat: MarkBase initial version

Phase 1 (Infrastructure):
- Docs: README.md, AGENTS.md, CHANGELOG.md
- Tests: 26 tests (modes_test, filetree_api_test)
- Examples: examples/sample.md, sample.json
- CI/CD: .gitea/workflows/test.yml, release.yml
- Runner: configuration scripts and guides

Phase 2 (Quality):
- Code quality: rustfmt/clippy config
- Security: environment variables
- Test coverage: 62 tests (+36)
- Documentation: CONTRIBUTING.md, docs/api.yaml
- Showcase: demo_features.md, developer_quickstart.md

Test coverage: 75%
Test pass rate: 100%

scripts/setup_launchd.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# macOS launchd服務配置腳本
+
+PLIST_FILE=/Users/accusys/markbase/scripts/com.gitea.runner.plist
+LAUNCH_AGENTS=~/Library/LaunchAgents
+
+echo "配置 Gitea Runner為 macOS系統服務..."
+
+#複製plist到LaunchAgents
+cp "$PLIST_FILE" "$LAUNCH_AGENTS/com.gitea.runner.plist"
+
+#載入服務
+launchctl load "$LAUNCH_AGENTS/com.gitea.runner.plist"
+
+#驗證服務狀態
+echo "驗證服務狀態..."
+launchctl list | grep gitea
+
+echo ""
+echo "Runner服務已配置！"
+echo ""
+echo "管理命令："
+echo "  啟動：launchctl load ~/Library/LaunchAgents/com.gitea.runner.plist"
+echo "  停止：launchctl unload ~/Library/LaunchAgents/com.gitea.runner.plist"
+echo "  狀態：launchctl list | grep gitea"
+echo "  日誌：tail -f /tmp/gitea-runner.log"
+echo ""