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.service.ts

@@ -0,0 +1,63 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { MapLibrary } from '../../entities/map-library.entity';
+import { MapRotation } from '../../entities/map-rotation.entity';
+import { UpdateRotationDto } from './dto/update-rotation.dto';
+
+@Injectable()
+export class MapsService {
+  constructor(
+    @InjectRepository(MapLibrary)
+    private readonly mapLibraryRepo: Repository<MapLibrary>,
+    @InjectRepository(MapRotation)
+    private readonly mapRotationRepo: Repository<MapRotation>,
+  ) {}
+
+  async getMaps(licenseId: string): Promise<{ maps: MapLibrary[] }> {
+    const maps = await this.mapLibraryRepo.find({
+      where: { license_id: licenseId },
+      order: { uploaded_at: 'DESC' },
+    });
+    return { maps };
+  }
+
+  async deleteMap(licenseId: string, mapId: string): Promise<void> {
+    const result = await this.mapLibraryRepo.delete({
+      id: mapId,
+      license_id: licenseId,
+    });
+
+    if (result.affected === 0) {
+      throw new NotFoundException(`Map ${mapId} not found`);
+    }
+  }
+
+  async getRotation(licenseId: string): Promise<MapRotation[]> {
+    return this.mapRotationRepo.find({
+      where: { license_id: licenseId },
+      relations: ['map'],
+      order: { rotation_order: 'ASC' },
+    });
+  }
+
+  async updateRotation(licenseId: string, dto: UpdateRotationDto): Promise<MapRotation[]> {
+    // Delete existing rotation entries for this license
+    await this.mapRotationRepo.delete({ license_id: licenseId });
+
+    // Create new rotation entries
+    const rotationEntries = dto.maps.map((entry) =>
+      this.mapRotationRepo.create({
+        license_id: licenseId,
+        map_id: entry.map_id,
+        rotation_order: entry.rotation_order,
+        is_active: true,
+      }),
+    );
+
+    await this.mapRotationRepo.save(rotationEntries);
+
+    // Return updated rotation with map data
+    return this.getRotation(licenseId);
+  }
+}