feat: Wave 2 — entities, security guards, API key encryption (15 files)

Entities:
- Create 5 new TypeORM entities: webstore_config, webstore_categories,
  webstore_items, webstore_transactions, module_store (all verified against live DB)
- Fix wipe-profile entity: remove incorrect default {} for pre/post wipe configs

Security:
- Add @RequirePermission guards to 7 controllers (36 endpoints total):
  team, webstore, notifications, alerts, analytics, settings, schedules
- Encrypt panel API key with AES-256-GCM in setup service (was plaintext)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend-nest/src/modules/notifications/notifications.controller.ts

@@ -7,6 +7,7 @@ import {
 } from '@nestjs/swagger';
 import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard';
 import { CurrentTenant } from '../../common/decorators/current-tenant.decorator';
+import { RequirePermission } from '../../common/decorators/require-permission.decorator';
 import { NotificationsService } from './notifications.service';
 import { UpdateConfigDto } from './dto/update-config.dto';
 
@@ -18,6 +19,7 @@ export class NotificationsController {
   constructor(private readonly notificationsService: NotificationsService) {}
 
   @Get('config')
+  @RequirePermission('notifications.view')
   @ApiOperation({
     summary: 'Get notification configuration',
     description: 'Returns notification settings for this license',
@@ -32,6 +34,7 @@ export class NotificationsController {
   }
 
   @Put('config')
+  @RequirePermission('notifications.manage')
   @ApiOperation({
     summary: 'Update notification configuration',
     description: 'Update notification settings for this license',