feat: 添加导航页密码保护功能

- 使用 CryptoJS AES-256 加密页面内容
- 添加密码输入界面，正确密码解锁显示
- 修复 fnos NAS 端口 5000 → 5667
- 添加加密生成脚本 generate-encrypted.js

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package-lock.json

@@ -0,0 +1,18 @@
+{
+  "name": "ai-community",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "crypto-js": "^4.2.0"
+      }
+    },
+    "node_modules/crypto-js": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/crypto-js/-/crypto-js-4.2.0.tgz",
+      "integrity": "sha512-KALDyEYgpY+Rlob/iriUtjV6d5Eq+Y191A5g4UqLAi8CyGP9N1+FdVbkc1SxKc2r4YAYqG8JzO2KGL+AizD70Q==",
+      "license": "MIT"
+    }
+  }
+}