ci: 添加小程序自动部署配置

- 添加 Gitea Actions workflow: miniapp-preview.yml
- 添加 CI 脚本: upload-ci.cjs, preview-ci.cjs
- 添加版本解析: resolve-version.cjs, resolve-upload-desc.cjs
- 添加 mini/package.json 用于 miniprogram-ci 依赖

mini/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "lunar-mini",
+  "version": "1.0.0",
+  "description": "祈福小助手 - 万年历微信小程序",
+  "private": true,
+  "scripts": {
+    "test": "echo \"No tests yet\" && exit 0",
+    "upload": "node ci/upload-ci.cjs",
+    "preview": "node ci/preview-ci.cjs"
+  },
+  "devDependencies": {
+    "miniprogram-ci": "^2.0.0"
+  }
+}