feat(#369): install @mosaicstack/telemetry-client in API

- Add .npmrc with scoped Gitea npm registry for @mosaicstack packages
- Create MosaicTelemetryModule (global, lifecycle-aware) at
  apps/api/src/mosaic-telemetry/
- Create MosaicTelemetryService wrapping TelemetryClient with
  convenience methods: trackTaskCompletion, getPrediction,
  refreshPredictions, eventBuilder
- Create mosaic-telemetry.config.ts for env var integration via
  NestJS ConfigService
- Register MosaicTelemetryModule in AppModule
- Add 32 unit tests covering module init, service methods, disabled
  mode, dry-run mode, and lifecycle management

Refs #369

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

apps/api/src/mosaic-telemetry/mosaic-telemetry.module.ts

@@ -0,0 +1,37 @@
+import { Module, Global } from "@nestjs/common";
+import { ConfigModule } from "@nestjs/config";
+import { MosaicTelemetryService } from "./mosaic-telemetry.service";
+
+/**
+ * Global module providing Mosaic Telemetry integration via @mosaicstack/telemetry-client.
+ *
+ * Tracks task completion events and provides crowd-sourced predictions for
+ * token usage, cost estimation, and quality metrics.
+ *
+ * **This is separate from the OpenTelemetry (OTEL) TelemetryModule** which
+ * handles distributed request tracing. This module is specifically for
+ * Mosaic Stack's own telemetry aggregation service.
+ *
+ * Configuration via environment variables:
+ * - MOSAIC_TELEMETRY_ENABLED (boolean, default: true)
+ * - MOSAIC_TELEMETRY_SERVER_URL (string)
+ * - MOSAIC_TELEMETRY_API_KEY (string, 64-char hex)
+ * - MOSAIC_TELEMETRY_INSTANCE_ID (string, UUID)
+ * - MOSAIC_TELEMETRY_DRY_RUN (boolean, default: false)
+ *
+ * @example
+ * ```typescript
+ * // In any service (no need to import module — it's global):
+ * @Injectable()
+ * export class MyService {
+ *   constructor(private readonly telemetry: MosaicTelemetryService) {}
+ * }
+ * ```
+ */
+@Global()
+@Module({
+  imports: [ConfigModule],
+  providers: [MosaicTelemetryService],
+  exports: [MosaicTelemetryService],
+})
+export class MosaicTelemetryModule {}