integrate backend Google OAuth and set up avatar media proxy

- Implement the full login and onboarding workflow to handle name, handle, and avatar.

- Rewrite avatar asset URLs to route through the self-hosted media service.

- Add Next.js rewrites configuration to proxy media requests directly to the FastAPI backend.

app/login/page.tsx

@@ -8,31 +8,33 @@ export default function LoginPage() {
 
   const handleGoogleLogin = () => {
     setIsLoading(true);
+    // 指向 FastAPI 的 Google OAuth 入口
+    // 登录成功后，FastAPI 会重定向回 http://localhost:3000/ (即你的根目录分流器)
     window.location.href = `${process.env.NEXT_PUBLIC_API_URL}/login/google`;
   };
 
   return (
-    <div className="min-h-screen bg-white flex flex-col">
+    <div className="min-h-screen bg-white flex flex-col font-sans">
       {/* Header */}
-      <div className="border-b border-gray-200">
+      <header className="border-b border-gray-100 bg-white/80 backdrop-blur-md sticky top-0 z-10">
         <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-4">
-          <Link href="/" className="flex items-center gap-2">
-            <div className="w-8 h-8 bg-gradient-to-br from-pink-600 to-purple-600 rounded-lg flex items-center justify-center">
+          <Link href="/" className="flex items-center gap-2 w-fit">
+            <div className="w-8 h-8 bg-linear-to-br from-pink-600 to-purple-600 rounded-lg flex items-center justify-center shadow-xs">
               <span className="text-white text-sm font-bold">RP</span>
             </div>
-            <span className="font-semibold text-lg">RoleplayAI</span>
+            <span className="font-bold text-lg tracking-tight text-gray-900">RoleplayAI</span>
           </Link>
         </div>
-      </div>
+      </header>
 
       {/* Main Content */}
-      <div className="flex-1 flex items-center justify-center py-12 px-4 sm:px-6 lg:px-8">
+      <main className="flex-1 flex items-center justify-center py-12 px-4 sm:px-6 lg:px-8">
         <div className="w-full max-w-md">
-          <div className="space-y-8">
+          <div className="bg-white rounded-2xl space-y-8">
             {/* Welcome Section */}
             <div className="space-y-2 text-center">
-              <h1 className="text-4xl font-bold">Welcome Back</h1>
-              <p className="text-gray-600">Sign in to continue to RoleplayAI</p>
+              <h1 className="text-4xl font-extrabold tracking-tight text-gray-900">Welcome Back</h1>
+              <p className="text-gray-500 font-medium">Sign in to continue your adventure</p>
             </div>
 
             {/* Google OAuth Button */}
@@ -40,95 +42,103 @@ export default function LoginPage() {
               <button
                 onClick={handleGoogleLogin}
                 disabled={isLoading}
-                className="w-full border-2 border-gray-200 rounded-xl py-3 px-4 font-medium hover:bg-gray-50 transition flex items-center justify-center gap-3 disabled:opacity-50"
+                className="w-full border-2 border-gray-200 rounded-xl py-3.5 px-4 font-semibold hover:bg-gray-50 hover:border-gray-300 transition-all flex items-center justify-center gap-3 disabled:opacity-50 disabled:cursor-not-allowed group"
               >
-                <svg className="w-5 h-5" viewBox="0 0 24 24">
-                  <path
-                    fill="currentColor"
-                    d="M12.545,10.239v3.821h5.445c-0.712,2.315-2.647,3.972-5.445,3.972c-3.332,0-6.033-2.701-6.033-6.032 c0-3.331,2.701-6.032,6.033-6.032c1.498,0,2.866,0.549,3.921,1.453l2.814-2.814C17.461,2.268,15.365,1,12.545,1 C6.477,1,1.54,5.952,1.54,12s4.938,11,11.005,11c6.071,0,11.067-4.975,11.067-11c0-0.713-0.092-1.405-0.196-2.067H12.545z"
-                  />
-                </svg>
-                {isLoading ? "Signing in..." : "Continue with Google"}
+                {!isLoading ? (
+                  <>
+                    <svg className="w-5 h-5 group-hover:scale-110 transition-transform" viewBox="0 0 24 24">
+                      <path
+                        fill="currentColor"
+                        d="M12.545,10.239v3.821h5.445c-0.712,2.315-2.647,3.972-5.445,3.972c-3.332,0-6.033-2.701-6.033-6.032 c0-3.331,2.701-6.032,6.033-6.032c1.498,0,2.866,0.549,3.921,1.453l2.814-2.814C17.461,2.268,15.365,1,12.545,1 C6.477,1,1.54,5.952,1.54,12s4.938,11,11.005,11c6.071,0,11.067-4.975,11.067-11c0-0.713-0.092-1.405-0.196-2.067H12.545z"
+                      />
+                    </svg>
+                    <span>Continue with Google</span>
+                  </>
+                ) : (
+                  <div className="flex items-center gap-2">
+                    <div className="w-4 h-4 border-2 border-gray-300 border-t-black rounded-full animate-spin" />
+                    <span>Redirecting...</span>
+                  </div>
+                )}
               </button>
             </div>
 
             {/* Divider */}
             <div className="relative">
               <div className="absolute inset-0 flex items-center">
-                <div className="w-full border-t border-gray-200"></div>
+                <div className="w-full border-t border-gray-100"></div>
               </div>
-              <div className="relative flex justify-center text-sm">
-                <span className="px-2 bg-white text-gray-500">or</span>
+              <div className="relative flex justify-center text-xs uppercase font-bold tracking-widest">
+                <span className="px-4 bg-white text-gray-400">or</span>
               </div>
             </div>
 
-            {/* Email Form */}
-            <form className="space-y-4">
+            {/* Email Form (Disabled) */}
+            <form className="space-y-4" onSubmit={(e) => e.preventDefault()}>
               <div>
-                <label htmlFor="email" className="block text-sm font-medium mb-2">
+                <label htmlFor="email" className="block text-sm font-bold text-gray-700 mb-2">
                   Email Address
                 </label>
                 <input
                   type="email"
                   id="email"
                   placeholder="you@example.com"
-                  className="w-full px-4 py-3 border-2 border-gray-200 rounded-xl focus:border-black focus:outline-none transition"
+                  className="w-full px-4 py-3 border-2 border-gray-100 rounded-xl bg-gray-50/50 text-gray-400 cursor-not-allowed outline-none"
                   disabled
                 />
-                <p className="text-xs text-gray-500 mt-2">Email login coming soon</p>
+                <div className="mt-3 flex items-center gap-2 text-amber-600 bg-amber-50 px-3 py-2 rounded-lg border border-amber-100">
+                  <span className="text-[11px] font-bold uppercase tracking-wider">Coming Soon</span>
+                  <span className="text-xs font-medium">Email login is currently in beta</span>
+                </div>
               </div>
             </form>
 
             {/* Agreement Text */}
-            <p className="text-center text-sm text-gray-600">
+            <p className="text-center text-xs text-gray-500 leading-relaxed">
               By signing in, you agree to our{" "}
-              <a href="#" className="text-black font-medium hover:underline">
+              <a href="#" className="text-gray-900 font-bold hover:underline underline-offset-4">
                 Terms of Service
               </a>{" "}
               and{" "}
-              <a href="#" className="text-black font-medium hover:underline">
+              <a href="#" className="text-gray-900 font-bold hover:underline underline-offset-4">
                 Privacy Policy
               </a>
             </p>
 
             {/* Footer Links */}
-            <div className="space-y-3 text-center text-sm">
-              <p>
-                Don't have an account?{" "}
-                <a href="#" className="text-black font-medium hover:underline">
-                  Sign up
-                </a>
-              </p>
-              <p>
-                <a href="/" className="text-gray-600 hover:text-black">
-                  Back to Home
-                </a>
+            <div className="pt-6 border-t border-gray-100 space-y-4 text-center">
+              <p className="text-sm text-gray-600">
+                Don&apos;t have an account?{" "}
+                <Link href="/" className="text-pink-600 font-bold hover:text-pink-700 transition-colors">
+                  Sign up for free
+                </Link>
               </p>
+              <Link 
+                href="/" 
+                className="inline-block text-sm font-semibold text-gray-400 hover:text-gray-900 transition-colors"
+              >
+                ← Back to Home
+              </Link>
             </div>
           </div>
 
           {/* Trust Indicators */}
-          <div className="mt-12 pt-8 border-t border-gray-200 space-y-6">
-            <p className="text-center text-xs text-gray-500">TRUSTED BY</p>
-            <div className="flex justify-center items-center gap-6 text-gray-400">
-              <div className="text-center">
-                <div className="text-2xl font-bold text-gray-600">10K+</div>
-                <p className="text-xs">Users</p>
-              </div>
-              <div className="w-px h-8 bg-gray-200"></div>
-              <div className="text-center">
-                <div className="text-2xl font-bold text-gray-600">1000+</div>
-                <p className="text-xs">Characters</p>
-              </div>
-              <div className="w-px h-8 bg-gray-200"></div>
-              <div className="text-center">
-                <div className="text-2xl font-bold text-gray-600">24/7</div>
-                <p className="text-xs">Support</p>
-              </div>
+          <div className="mt-12 grid grid-cols-3 gap-4 border-t border-gray-100 pt-8">
+            <div className="text-center">
+              <div className="text-xl font-bold text-gray-900">10K+</div>
+              <p className="text-[10px] font-bold text-gray-400 uppercase tracking-tighter">Active Users</p>
+            </div>
+            <div className="text-center border-x border-gray-100">
+              <div className="text-xl font-bold text-gray-900">1000+</div>
+              <p className="text-[10px] font-bold text-gray-400 uppercase tracking-tighter">AI Models</p>
+            </div>
+            <div className="text-center">
+              <div className="text-xl font-bold text-gray-900">24/7</div>
+              <p className="text-[10px] font-bold text-gray-400 uppercase tracking-tighter">Fast Support</p>
             </div>
           </div>
         </div>
-      </div>
+      </main>
     </div>
   );
-}
+}