feat(layout): 重构布局组件体系与数据层

- 重构 Header 导航、Footer 页脚、MobileMenu 移动端菜单
- 新增 MobileTabBar 移动端底部导航栏
- 更新 MegaDropdown 大型下拉导航
- 重构 SEO 结构化数据组件
- 更新数据层常量 (products, services, solutions, navigation 等)
- 新增 useCountUp 数字递增 Hook
- 修复 .gitignore 中 src/lib 被错误忽略的问题

src/hooks/use-count-up.ts

@@ -0,0 +1,63 @@
+'use client';
+
+import { useState, useEffect, useRef } from 'react';
+
+interface UseCountUpOptions {
+  end: number;
+  duration?: number;
+  start?: number;
+  decimals?: number;
+  easing?: (t: number) => number;
+  enabled?: boolean;
+}
+
+const easeOutCubic = (t: number) => 1 - Math.pow(1 - t, 3);
+
+export function useCountUp({
+  end,
+  duration = 1800,
+  start = 0,
+  decimals = 0,
+  easing = easeOutCubic,
+  enabled = true,
+}: UseCountUpOptions) {
+  const [value, setValue] = useState(start);
+  const startTimeRef = useRef<number | null>(null);
+  const frameRef = useRef<number>(0);
+
+  useEffect(() => {
+    if (!enabled) {
+      setValue(end);
+      return;
+    }
+
+    setValue(start);
+    startTimeRef.current = null;
+
+    const animate = (now: number) => {
+      if (startTimeRef.current === null) {
+        startTimeRef.current = now;
+      }
+
+      const progress = Math.min((now - startTimeRef.current) / duration, 1);
+      const eased = easing(progress);
+      const current = start + (end - start) * eased;
+
+      setValue(Number(current.toFixed(decimals)));
+
+      if (progress < 1) {
+        frameRef.current = requestAnimationFrame(animate);
+      } else {
+        setValue(end);
+      }
+    };
+
+    frameRef.current = requestAnimationFrame(animate);
+
+    return () => {
+      cancelAnimationFrame(frameRef.current);
+    };
+  }, [end, duration, start, decimals, easing, enabled]);
+
+  return value;
+}