feat(site): 对齐参考站点UI与交互调整

- 页脚：响应耗时文字统一为「响应耗时 XXXms」，版本链接改为 GitHub 官方仓库，默认 ICP 备案号设置为粤ICP备2025450093号
- 顶部栏：恢复主题切换按钮与语言按钮（语言暂为占位提示），放置于用户区左侧
- 主题：修复首屏内联脚本默认主题白名单校验，避免 localStorage 中残留的 light/dark/System 等非法值生效，首屏默认改为 ClassicLight（仅允许 ClassicLight/ModernLight）
- 登录页：在密码输入框下方恢复「忘记密码？」入口，新增配套的找回密码引导页 /forgot-password
- 默认配置：system-settings 兜底记录与 SYSTEM_SETTINGS_DEFAULTS 新增 icpNumber 默认值

app/components/Auth/LoginForm.vue

@@ -74,6 +74,11 @@
             </svg>
           </button>
         </div>
+        <div class="forgot-password-row">
+          <NuxtLink to="/forgot-password" class="forgot-password-link">
+            忘记密码？
+          </NuxtLink>
+        </div>
       </div>
 
       <div v-if="error" class="error-container">
@@ -556,6 +561,25 @@ const handleWebAuthnLogin = async () => {
   height: 20px;
 }
 
+.forgot-password-row {
+  display: flex;
+  justify-content: flex-end;
+  margin-top: 10px;
+}
+
+.forgot-password-link {
+  font-size: 13px;
+  color: var(--primary);
+  text-decoration: none;
+  font-weight: var(--font-medium);
+  transition: opacity 0.2s ease;
+}
+
+.forgot-password-link:hover {
+  opacity: 0.8;
+  text-decoration: underline;
+}
+
 .form-footer {
   margin-top: 24px;
   text-align: center;

app/components/SiteFooter.vue

@@ -23,11 +23,16 @@
       </span>
       <span v-if="siteTitle" class="footer-item">© {{ currentYear }} {{ siteTitle }}</span>
       <span v-else class="footer-item">© {{ currentYear }} {{ copyrightOwner }}</span>
-      <span class="footer-item">Worker in {{ responseTime }}ms</span>
+      <span class="footer-item">响应耗时 {{ responseTime }}ms</span>
       <span class="footer-item">
-        <NuxtLink class="voicehub-link" to="/changelog">
+        <a
+          class="voicehub-link"
+          href="https://github.com/laoshuikaixue/VoiceHub"
+          target="_blank"
+          rel="noopener noreferrer"
+        >
           {{ displayName }} v{{ systemVersion }}
-        </NuxtLink>
+        </a>
       </span>
       <span v-if="isNetlify" class="footer-item">
         <a