chore: 升级 VuePress/Plume 并迁移至 collections 配置

- 将 vuepress 升至 2.0.0-rc.26、vuepress-theme-plume 升至 1.0.0-rc.192

- 用 defineCollections 替代已废弃的 blog + notes，新增 collections.ts 并删除 notes.ts

- 通过 package overrides 将 @vuepress/helper 固定为 rc.123，避免 dev 下 encodeSVG 缺失导致首页白屏

- 新增 .npmrc（legacy-peer-deps）以兼容当前 peer 依赖解析

未包含 docs/.vuepress/dist 等构建产物。

Made-with: Cursor

package.json

@@ -7,6 +7,9 @@
   "engines": {
     "node": "^20.6.0 || >=22.0.0"
   },
+  "overrides": {
+    "@vuepress/helper": "2.0.0-rc.123"
+  },
   "scripts": {
     "docs:dev": "vuepress dev docs",
     "docs:dev-clean": "vuepress dev docs --clean-cache --clean-temp",
@@ -15,17 +18,17 @@
     "vp-update": "npx vp-update"
   },
   "devDependencies": {
-    "@vuepress/bundler-vite": "2.0.0-rc.24",
-    "@vuepress/plugin-umami-analytics": "^2.0.0-rc.112",
+    "@vuepress/bundler-vite": "2.0.0-rc.26",
+    "@vuepress/plugin-umami-analytics": "2.0.0-rc.112",
     "artalk": "^2.9.1",
     "http-server": "^14.1.1",
     "typescript": "^5.9.2",
     "vue": "^3.5.21",
-    "vuepress": "2.0.0-rc.24",
-    "vuepress-theme-plume": "1.0.0-rc.164"
+    "vuepress": "2.0.0-rc.26",
+    "vuepress-theme-plume": "1.0.0-rc.192"
   },
   "dependencies": {
-    "@vuepress/plugin-comment": "^2.0.0-rc.112",
+    "@vuepress/plugin-comment": "2.0.0-rc.123",
     "@waline/client": "^3.13.0",
     "mermaid": "^11.12.1"
   }