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/start_runner.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# MarkBase Gitea Runner啟動腳本
+
+RUNNER_BIN=~/.local/bin/gitea-runner
+CONFIG_FILE=/Users/accusys/markbase/.runner
+
+echo "啟動 Gitea Runner..."
+echo "Runner版本：v1.0.3"
+echo "Runner名稱：accusys-Mac-mini-M4-2.local"
+echo "Gitea地址：https://gitea.momentry.ddns.net"
+
+#檢查Runner配置是否存在
+if [ ! -f "$CONFIG_FILE" ]; then
+    echo "錯誤：Runner配置檔案不存在"
+    echo "請先執行：gitea-runner register --instance https://gitea.momentry.ddns.net --token <YOUR_TOKEN>"
+    exit 1
+fi
+
+#檢查Runner二進制檔案
+if [ ! -f "$RUNNER_BIN" ]; then
+    echo "錯誤：Runner未安裝"
+    echo "請先下載：curl -L -o ~/.local/bin/gitea-runner https://gitea.com/gitea/runner/releases/download/v1.0.3/gitea-runner-1.0.3-darwin-arm64"
+    exit 1
+fi
+
+#啟動Runner daemon
+echo "Runner正在啟動..."
+cd /Users/accusys/markbase
+$RUNNER_BIN daemon
+
+echo "Runner已停止"