feat(admin): 更新后台权限管理与同步逻辑，简化权限检查并优化文档

- 新增后台 RBAC 相关文档，提供权限目录与维护命令说明。
- 移除不必要的角色资源同步检查，简化权限审计命令。
- 更新权限描述与同步逻辑，确保一致性与可维护性。
- 统一权限注册表，替换过时的权限别名，增强代码可读性。

tests/Feature/AdminPermissionBridgeTest.php

@@ -0,0 +1,32 @@
+<?php
+
+use App\Support\AdminPermissionBridge;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+uses(RefreshDatabase::class);
+
+test('normalizeCanonicalLegacySlugs maps deprecated audit and report slugs', function (): void {
+    $normalized = AdminPermissionBridge::normalizeCanonicalLegacySlugs([
+        'prd.audit.finance',
+        'prd.report.player',
+        'prd.users.manage',
+    ]);
+
+    expect($normalized)->toBe([
+        'prd.audit.view',
+        'prd.report.view',
+        'prd.users.manage',
+    ]);
+});
+
+test('legacy permission slugs are derived from role menu actions only', function (): void {
+    $role = \App\Models\AdminRole::query()->create([
+        'slug' => 'derived_only',
+        'name' => 'Derived',
+    ]);
+
+    $role->syncLegacyPermissionSlugs(['prd.report.view']);
+
+    expect($role->fresh()->legacyPermissionSlugs())->toBe(['prd.report.view']);
+    expect(\Illuminate\Support\Facades\Schema::hasTable('admin_role_legacy_permissions'))->toBeFalse();
+});