feat: 实现 Mini Game AI 工具平台

基于 Next.js 15、React 19 和 TypeScript 构建面向小游戏开发者的 AI 赋能工具平台。

主要功能：
- 首页：包含 Hero、功能展示、优势介绍、定价和 CTA 区域
- 三大核心工具：视频转序列帧、图片压缩、音频压缩
- 响应式布局：包含顶部导航、页脚和侧边栏
- 文件上传：支持拖拽上传，使用 react-dropzone
- 进度追踪：实时显示上传和处理进度
- 可配置工具：每个工具都支持自定义参数配置
- 结果预览：支持下载处理后的文件
- 4K 优化：针对大屏幕优化的响应式设计
- API 路由：文件上传和处理的模拟实现

技术栈：
- Next.js 15 (App Router)
- React 19
- TypeScript (严格模式)
- Tailwind CSS（自定义 4K 断点）
- shadcn/ui 组件库
- Framer Motion 动画
- Zustand 状态管理

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

src/components/layout/Header.tsx

@@ -0,0 +1,111 @@
+"use client";
+
+import Link from "next/link";
+import { usePathname } from "next/navigation";
+import { useState } from "react";
+import { motion, AnimatePresence } from "framer-motion";
+import { Menu, X, Sparkles } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { cn } from "@/lib/utils";
+
+const navItems = [
+  { name: "Tools", href: "/tools" },
+  { name: "Pricing", href: "/pricing" },
+  { name: "Docs", href: "/docs" },
+  { name: "About", href: "/about" },
+];
+
+export function Header() {
+  const pathname = usePathname();
+  const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false);
+
+  return (
+    <header className="sticky top-0 z-50 w-full border-b border-border/40 bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/60">
+      <nav className="container flex h-16 items-center justify-between">
+        {/* Logo */}
+        <Link href="/" className="flex items-center space-x-2">
+          <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-primary">
+            <Sparkles className="h-5 w-5 text-primary-foreground" />
+          </div>
+          <span className="text-xl font-bold">Mini Game AI</span>
+        </Link>
+
+        {/* Desktop Navigation */}
+        <div className="hidden md:flex md:items-center md:space-x-6">
+          {navItems.map((item) => (
+            <Link
+              key={item.name}
+              href={item.href}
+              className={cn(
+                "text-sm font-medium transition-colors hover:text-primary",
+                pathname === item.href ? "text-primary" : "text-muted-foreground"
+              )}
+            >
+              {item.name}
+            </Link>
+          ))}
+        </div>
+
+        {/* CTA Buttons */}
+        <div className="hidden md:flex md:items-center md:space-x-4">
+          <Button variant="ghost" size="sm" asChild>
+            <Link href="/login">Sign In</Link>
+          </Button>
+          <Button size="sm" asChild>
+            <Link href="/register">Get Started</Link>
+          </Button>
+        </div>
+
+        {/* Mobile Menu Button */}
+        <button
+          className="md:hidden"
+          onClick={() => setIsMobileMenuOpen(!isMobileMenuOpen)}
+          aria-label="Toggle menu"
+        >
+          {isMobileMenuOpen ? (
+            <X className="h-6 w-6" />
+          ) : (
+            <Menu className="h-6 w-6" />
+          )}
+        </button>
+      </nav>
+
+      {/* Mobile Menu */}
+      <AnimatePresence>
+        {isMobileMenuOpen && (
+          <motion.div
+            initial={{ opacity: 0, height: 0 }}
+            animate={{ opacity: 1, height: "auto" }}
+            exit={{ opacity: 0, height: 0 }}
+            transition={{ duration: 0.2 }}
+            className="md:hidden border-t border-border/40"
+          >
+            <div className="container space-y-4 py-6">
+              {navItems.map((item) => (
+                <Link
+                  key={item.name}
+                  href={item.href}
+                  onClick={() => setIsMobileMenuOpen(false)}
+                  className={cn(
+                    "block text-sm font-medium transition-colors hover:text-primary",
+                    pathname === item.href ? "text-primary" : "text-muted-foreground"
+                  )}
+                >
+                  {item.name}
+                </Link>
+              ))}
+              <div className="flex flex-col space-y-2 pt-4">
+                <Button variant="ghost" size="sm" asChild className="w-full">
+                  <Link href="/login">Sign In</Link>
+                </Button>
+                <Button size="sm" asChild className="w-full">
+                  <Link href="/register">Get Started</Link>
+                </Button>
+              </div>
+            </div>
+          </motion.div>
+        )}
+      </AnimatePresence>
+    </header>
+  );
+}