feat: 修正庫存與撥補單邏輯並整合文件

1. 修復倉庫統計數據加總與樣式。
2. 修正可用庫存計算邏輯（排除不可銷售倉庫）。
3. 撥補單商品列表加入批號與效期顯示。
4. 修正撥補單儲存邏輯以支援精確批號轉移。
5. 整合 FEATURES.md 至 README.md。

database/migrations/tenant/2026_01_26_000001_create_recipes_tables.php

@@ -0,0 +1,45 @@
+<?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('recipes', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('product_id')->constrained('products')->onDelete('cascade')->comment('連結的成品商品 ID');
+            $table->string('code')->unique()->comment('配方代號');
+            $table->string('name')->comment('配方名稱');
+            $table->text('description')->nullable()->comment('配方描述');
+            $table->decimal('yield_quantity', 10, 2)->default(1.00)->comment('標準產出數量');
+            $table->boolean('is_active')->default(true)->comment('是否啟用');
+            $table->timestamps();
+            $table->softDeletes();
+        });
+
+        Schema::create('recipe_items', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('recipe_id')->constrained('recipes')->onDelete('cascade');
+            $table->foreignId('product_id')->constrained('products')->comment('原物料商品 ID');
+            $table->decimal('quantity', 10, 4)->comment('標準用量');
+            $table->foreignId('unit_id')->nullable()->constrained('units')->comment('單位 ID');
+            $table->string('remark')->nullable()->comment('備註');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('recipe_items');
+        Schema::dropIfExists('recipes');
+    }
+};

database/migrations/tenant/2026_01_26_000002_add_recipe_permissions.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Spatie\Permission\Models\Permission;
+use Spatie\Permission\Models\Role;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     * 
+     * 新增配方管理權限
+     */
+    public function up(): void
+    {
+        $guard = 'web';
+        
+        // 建立配方管理權限
+        $permissions = [
+            'recipes.view' => '檢視配方',
+            'recipes.create' => '建立配方',
+            'recipes.edit' => '編輯配方',
+            'recipes.delete' => '刪除配方',
+        ];
+
+        foreach ($permissions as $name => $description) {
+            Permission::firstOrCreate(
+                ['name' => $name, 'guard_name' => $guard],
+                ['name' => $name, 'guard_name' => $guard]
+            );
+        }
+
+        // 授予 super-admin 所有新權限
+        $superAdmin = Role::where('name', 'super-admin')->first();
+        if ($superAdmin) {
+            $superAdmin->givePermissionTo(array_keys($permissions));
+        }
+
+        // 授予 admin 所有新權限
+        $admin = Role::where('name', 'admin')->first();
+        if ($admin) {
+            $admin->givePermissionTo(array_keys($permissions));
+        }
+
+        // 授予 warehouse-manager 檢視權限 (配方通常與庫存相關)
+        $whManager = Role::where('name', 'warehouse-manager')->first();
+        if ($whManager) {
+            $whManager->givePermissionTo(['recipes.view']);
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        $permissions = [
+            'recipes.view',
+            'recipes.create',
+            'recipes.edit',
+            'recipes.delete',
+        ];
+
+        foreach ($permissions as $name) {
+            Permission::where('name', $name)->delete();
+        }
+    }
+};

database/migrations/tenant/2026_01_26_141823_add_is_sellable_to_warehouses_table.php

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+<?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::table('warehouses', function (Blueprint $table) {
+            $table->boolean('is_sellable')->default(true)->after('description')->comment('是否可銷售');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('warehouses', function (Blueprint $table) {
+            $table->dropColumn('is_sellable');
+        });
+    }
+};