chore: migrate to Bun, update deps and add Nuxt Fonts

- Replace pnpm with Bun (bun.lock, remove pnpm-lock.yaml)
- Add @nuxt/fonts module and configure Iconify icons
- Add NUXT_OG_IMAGE_SECRET for multi-instance OG image signing
- Update dependencies to latest versions
- Simplify Tailwind font configuration
- Add trustedDependencies and overrides for unhead packages

nuxt.config.ts

@@ -14,8 +14,20 @@ export default defineNuxtConfig({
     "@nuxtjs/sitemap",
     "@nuxt/icon",
     "@nuxtjs/seo",
+    "@nuxt/fonts",
   ],
 
+  icon: {
+    provider: "iconify",
+    collections: ["lucide", "simple-icons"],
+  },
+
+  ogImage: {
+    security: {
+      secret: process.env.NUXT_OG_IMAGE_SECRET || "3ecc76b00dd73f5124438ab14204714ce74ae172b2c5e57dce3ba2244b41aad9",
+    },
+  },
+
   // 禁用 Vue Router 的非关键警告
   vue: {
     compilerOptions: {
@@ -111,4 +123,4 @@ export default defineNuxtConfig({
       wakatimeApiUrl: process.env.WAKATIME_API_URL ?? "https://wakatime.com/api/v1",
     },
   },
-});
+});