feat: 页面模板差异化改进 + 配置优化 + 兼容清理 (#29)

- 首页判定：navigation 第一项
- 模板：page/projects/articles/bookmarks/search-results
- bookmarks：update: YYYY-MM-DD | from: git|mtime
- articles：RSS 聚合只读条目 + 分类聚合 + 影子写回结构
- projects：repo 卡片 + 可选热力图 + 自动抓取元信息
- 工作流：构建前 sync + schedule 定时刷新
- 移除兼容：config.yml/config.yaml、navigation.yml、home 特例
- 迁移说明：config/update-instructions.md

package.json

@@ -6,9 +6,12 @@
   "homepage": "https://rbetree.github.io/menav",
   "scripts": {
     "generate": "node src/generator.js",
-    "dev": "node src/generator.js && serve dist -l 5173",
+    "dev": "npm run sync-projects && npm run sync-articles && node src/generator.js && serve dist -l 5173",
+    "dev:offline": "node src/generator.js && serve dist -l 5173",
     "clean": "node ./scripts/clean.js",
     "build": "npm run clean && npm run generate",
+    "sync-articles": "node ./scripts/sync-articles.js",
+    "sync-projects": "node ./scripts/sync-projects.js",
     "import-bookmarks": "node src/bookmark-processor.js",
     "test": "node --test test/*.js",
     "lint": "node --check \"src/generator.js\" && node --check \"src/bookmark-processor.js\" && node --check \"src/script.js\"",
@@ -32,7 +35,8 @@
     "has-flag": "^5.0.1",
     "color-convert": "^2.0.1",
     "color-name": "^2.0.0",
-    "mime-db": "^1.52.0"
+    "mime-db": "^1.52.0",
+    "rss-parser": "^3.13.0"
   },
   "devDependencies": {
     "prettier": "^3.4.2",