feat(admin): add ephemeral staging DB, read-only posts overview, and dynamic search

- Implement ephemeral staging mode (APP_ENV=staging) to isolate test/dev DB writes in /tmp
- Add read-only posts management dashboard under /guanli/posts with live links and comment counters
- Add hot re-indexing endpoint (/guanli/reindex) to refresh Markdown without restarting server
- Replace static recommended search config with dynamic frequency-based trending searches
- Remove early scaffold mockup file (dropbox/zh.md) and clean legacy mock test queries
- Add native Makefile with dev, dev-persistent, test, lint, and docker targets
- Update test suite and documentation for development workflows

sample-content/config.yaml

@@ -30,11 +30,6 @@ social:
   - platform: email
     address: "[email protected]"
 
-search:
-  recommended:
-    - label: 'tag:k8s "container image" category:tech'
-      query: 'tag:k8s "container image" category:tech'
-
 plugins:
   google-analytics:
     enabled: true

sample-content/posts/using-gemini-cli-and-mcp-server-to-organize-my-dropbox/zh.md

@@ -1,27 +0,0 @@
----
-title: "使用 Gemini-CLI 与 MCP 服务整理 Dropbox"
-date: 2025-08-31
-author: "haopengzhan"
-category: "Tech"
-tags: ["AI Era", "Dropbox", "Gemini", "LLM", "Productivity", "k8s"]
-excerpt: "面对堆积如山的 Dropbox 文件，如何使用大语言模型与 Model Context Protocol 构建自动化归档助手？"
-cover: images/cover.svg
-lang: zh
----
-
-我想很多人都会遇到和我一样的困境：多年累积的单据、学术论文、照片杂乱无章地存放在 Dropbox 中。
-
-在日常管理集群基础设施时，我们通过标准化的 **container image** 保持每个节点的干净与可复现。但我们的个人存储往往像一个臃肿的单体遗留系统。
-
-## 云存储的管理困境
-
-传统的文件夹分类需要大量人工维护，而且往往随着时间推移逐渐失控。借助 MCP 协议，我们可以让 AI 拥有读写文件的上下文能力。
-
-```bash
-# 启动 MCP 服务
-npx -y @modelcontextprotocol/server-dropbox
-```
-
-## 总结与成效
-
-现在每天晚上脚本自动运行，未分类文件自动按年月和类别归档，大幅提升了个人数字资产的管理效率。