feat: 前端分離+功能api化

1. 新增資產管理CRUD、googleOAuth登入
2. 更改原記帳controller

app/Http/Controllers/Auth/GoogleAuthController.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Http\Controllers\Auth;
+
+use App\Http\Controllers\Controller;
+use App\Models\User;
+use Illuminate\Support\Facades\Auth;
+use Laravel\Socialite\Facades\Socialite;
+
+class GoogleAuthController extends Controller
+{
+    // 導向 Google 登入頁
+    public function redirect()
+    {
+        return Socialite::driver('google')
+            ->scopes(['https://www.googleapis.com/auth/gmail.readonly'])
+            ->with([
+                'access_type' => 'offline',   // 💡 極其重要：強制要求 Google 回傳長期有效的 refresh_token
+                'prompt' => 'consent'    // 💡 強制跳出授權提示，確保每次都能順利拿到憑證
+            ])
+            ->redirect();
+    }
+
+    // Google 打回來後處理
+    public function callback()
+    {
+        $googleUser = Socialite::driver('google')->stateless()->user();
+
+        $user = User::updateOrCreate(
+            ['email' => $googleUser->getEmail()],
+            [
+                'name' => $googleUser->getName(),
+                'google_id' => $googleUser->getId(),
+                'avatar' => $googleUser->getAvatar(),
+                'password' => bcrypt(str()->random(24)),
+                'google_access_token' => $googleUser->token,
+                'google_refresh_token' => $googleUser->refreshToken, // 💡 只有第一次授權或加了 prompt=consent 才會給
+                'google_token_expires_at' => now()->addSeconds($googleUser->expiresIn),
+            ]
+        );
+
+        if ($googleUser->refreshToken) {
+            $user->update(['google_refresh_token' => $googleUser->refreshToken]);
+        }
+
+        $token = $user->createToken('auth_token')->plainTextToken;
+
+        // 把 token 帶回前端
+        return redirect("http://localhost:5173/#/auth/callback?token={$token}&name=" . urlencode($user->name));
+    }
+}