feat: Complete stub services with real implementations and graceful not-configured responses

- ChangelogService: inject PlatformChangelog repo, query with findAndCount(skip/take), return actual data
- ChangelogModule: add TypeOrmModule.forFeature([PlatformChangelog])
- MapsService: add uploadMap() — SHA-256 checksum, storage path, full entity save
- MapsController: add POST /maps/upload with FileInterceptor, map.manage permission, @UploadedFile
- AuthService: replace console.log stubs with Logger; forgotPassword returns 200 with clear message; resetPassword throws NotImplementedException
- PluginsService: searchUmod returns { results: [], message: 'not yet configured' } instead of bare []
- SteamService: add Logger.warn on every stub path (checkForceWipe, getPlayerSummary)
- SettingsService: add Logger; both Cloudflare DNS stubs emit Logger.warn before DB save
- MigrationService: add Logger; exportConfig logs warning + returns note field; importConfig throws NotImplementedException
- Install @types/multer dev dependency for Express.Multer.File type support

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

backend-nest/src/modules/migration/migration.service.ts

@@ -1,16 +1,22 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable, NotImplementedException, Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
 import { MigrationExport } from '../../entities/migration-export.entity';
 
 @Injectable()
 export class MigrationService {
+  private readonly logger = new Logger(MigrationService.name);
+
   constructor(
     @InjectRepository(MigrationExport)
     private readonly exportRepo: Repository<MigrationExport>,
   ) {}
 
-  async exportConfig(licenseId: string, userId: string, exportType: string = 'full'): Promise<MigrationExport> {
+  async exportConfig(licenseId: string, userId: string, exportType: string = 'full'): Promise<MigrationExport & { note: string }> {
+    this.logger.warn(
+      `Export requested for license ${licenseId} by user ${userId} — file generation not yet implemented, DB record only`,
+    );
+
     const expiresAt = new Date();
     expiresAt.setDate(expiresAt.getDate() + 7); // 7 days expiry
 
@@ -18,12 +24,17 @@ export class MigrationService {
       license_id: licenseId,
       export_type: exportType,
       storage_path: `/exports/${licenseId}/${Date.now()}.json`,
-      file_size_bytes: 0, // Stub - would calculate after actual export
+      file_size_bytes: 0,
       created_by: userId,
       expires_at: expiresAt,
     });
 
-    return this.exportRepo.save(exportRecord);
+    const saved = await this.exportRepo.save(exportRecord);
+
+    return {
+      ...saved,
+      note: 'Export record created. File generation is pending implementation.',
+    };
   }
 
   async getExports(licenseId: string): Promise<MigrationExport[]> {
@@ -33,8 +44,8 @@ export class MigrationService {
     });
   }
 
-  async importConfig(licenseId: string, data: any): Promise<{ message: string }> {
-    // Stub implementation - would validate and import data in production
-    return { message: 'Import complete' };
+  async importConfig(licenseId: string, _data: any): Promise<never> {
+    this.logger.warn(`Import attempted for license ${licenseId} — not yet implemented`);
+    throw new NotImplementedException('Migration import not yet available');
   }
 }