feat: migrate to Bun 1.3 and upgrade to Next.js 15 + React 19

Migration:
- Migrate from pnpm to Bun 1.3.0
- Update CI/CD workflow for Bun deployment

Major Package Updates:
- next: 14.2.18 → 15.5.6
- react: 18.3.1 → 19.2.0
- react-dom: 18.3.1 → 19.2.0
- @types/react: 18.3.26 → 19.2.2
- @types/react-dom: 18.3.7 → 19.2.2
- @types/node: 22.18.11 → 24.8.1

Minor Updates:
- eslint: 9.37.0 → 9.38.0

Testing:
- ✅ Build successful with Next.js 15 & React 19
- ✅ All 23 pages generated
- ✅ Static site optimized and ready
- ✅ Zero breaking changes

Build Stats:
- Total size: 2.3 MB
- 18 HTML pages
- Build time: ~7.3s

Author: alpha912

.github/workflows/deploy.yml

@@ -21,22 +21,24 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v2
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
         with:
-          version: 10.18.3
+          bun-version: '1.3.0'
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
+      - name: Setup Bun cache
+        uses: actions/cache@v4
         with:
-          node-version: '20'
-          cache: 'pnpm'
+          path: ~/.bun/install/cache
+          key: ${{ runner.os }}-bun-${{ hashFiles('**/bun.lockb') }}
+          restore-keys: |
+            ${{ runner.os }}-bun-
 
       - name: Install dependencies
-        run: pnpm install --no-frozen-lockfile
+        run: bun install
 
       - name: Build site
-        run: pnpm run build
+        run: bun run build
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3