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/Api/CategoryController.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\Category;
+use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
+use Illuminate\Http\Request;
+
+class CategoryController extends Controller
+{
+    use AuthorizesRequests;
+
+    /**
+     * 新增分類
+     * POST /api/categories
+     */
+    public function store(Request $request)
+    {
+        $validated = $request->validate([
+            'name'  => 'required|string|max:255',
+            'color' => 'nullable|string|max:7',
+            'icon'  => 'nullable|string|max:50',
+        ]);
+
+        $category = Category::create([
+            ...$validated,
+            'user_id' => $request->user()->id,
+        ]);
+
+        // 🟢 修正：回傳剛剛建立的 JSON 資料與 201 狀態碼給前端 push 入陣列
+        return response()->json($category, 201);
+    }
+
+    /**
+     * 修改分類
+     * PUT /api/categories/{category}
+     */
+    public function update(Request $request, Category $category)
+    {
+        $this->authorize('update', $category);
+
+        $validated = $request->validate([
+            'name'  => 'required|string|max:255',
+            'color' => 'nullable|string|max:7',
+        ]);
+
+        $category->update($validated);
+
+        // 🟢 修正：回傳修改後的最新資料，讓前端動態替換
+        return response()->json($category);
+    }
+
+    /**
+     * 刪除分類
+     * DELETE /api/categories/{category}
+     */
+    public function destroy(Category $category)
+    {
+        $this->authorize('delete', $category);
+        $category->delete();
+
+        return response()->json(['message' => '分類刪除成功']);
+    }
+}