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

database/migrations/2026_06_16_183426_securities.php

@@ -0,0 +1,39 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('securities', function (Blueprint $table) {
+            $table->id();
+ 
+            $table->string('code', 20);
+            $table->enum('type', ['stock', 'etf', 'fund']);
+            $table->string('source', 20); // twse, tpex, cnyes
+            $table->string('name'); // 中文名稱/簡稱
+ 
+            $table->decimal('latest_price', 15, 4)->nullable(); // 最新報價/淨值
+            $table->timestamp('latest_price_at')->nullable(); // 最新報價/淨值時間
+            $table->decimal('change_amount', 15, 4)->nullable(); // 漲跌
+            $table->decimal('change_rate', 8, 4)->nullable(); // 漲跌幅(%)
+ 
+            $table->jsonb('meta')->nullable(); // 基金專屬額外資訊(category、riskLevel、isinCode...)
+ 
+            $table->timestamps();
+ 
+            $table->unique(['code', 'type']);
+        });
+    }
+ 
+    public function down(): void
+    {
+        Schema::dropIfExists('securities');
+    }
+};