feat(api): add RoutesModule with GET/POST/DELETE /routes endpoints

Implements RoutesService and RoutesController for SyncRoute CRUD, wires
GroupsModule and RoutesModule into AppModule; 11 new tests, all 31 pass.

apps/api/src/app.module.ts

@@ -3,6 +3,8 @@ import { ConfigModule } from '@nestjs/config';
 import { PrismaModule } from './prisma/prisma.module';
 import { HealthModule } from './modules/health/health.module';
 import { SearchModule } from './modules/search/search.module';
+import { GroupsModule } from './modules/groups/groups.module';
+import { RoutesModule } from './modules/routes/routes.module';
 
 @Module({
   imports: [
@@ -10,6 +12,8 @@ import { SearchModule } from './modules/search/search.module';
     PrismaModule,
     HealthModule,
     SearchModule,
+    GroupsModule,
+    RoutesModule,
   ],
 })
 export class AppModule {}