fix: Add missing maps module and scope gitignore rules

maps/ gitignore rule was catching backend-nest/src/modules/maps/.
Scoped to /maps/ (root only) so runtime data is still ignored
but source code isn't.

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

backend-nest/src/modules/maps/maps.module.ts

@@ -0,0 +1,14 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { MapsController } from './maps.controller';
+import { MapsService } from './maps.service';
+import { MapLibrary } from '../../entities/map-library.entity';
+import { MapRotation } from '../../entities/map-rotation.entity';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([MapLibrary, MapRotation])],
+  controllers: [MapsController],
+  providers: [MapsService],
+  exports: [MapsService],
+})
+export class MapsModule {}