feat(#373): prediction integration for cost estimation

- Create PredictionService for pre-task cost/token estimates
- Refresh common predictions on startup
- Integrate predictions into LLM telemetry tracker
- Add GET /api/telemetry/estimate endpoint
- Graceful degradation when no prediction data available
- Add unit tests for prediction service

Refs #373

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

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

@@ -1,6 +1,9 @@
 import { Module, Global } from "@nestjs/common";
 import { ConfigModule } from "@nestjs/config";
+import { AuthModule } from "../auth/auth.module";
 import { MosaicTelemetryService } from "./mosaic-telemetry.service";
+import { PredictionService } from "./prediction.service";
+import { MosaicTelemetryController } from "./mosaic-telemetry.controller";
 
 /**
  * Global module providing Mosaic Telemetry integration via @mosaicstack/telemetry-client.
@@ -30,8 +33,9 @@ import { MosaicTelemetryService } from "./mosaic-telemetry.service";
  */
 @Global()
 @Module({
-  imports: [ConfigModule],
-  providers: [MosaicTelemetryService],
-  exports: [MosaicTelemetryService],
+  imports: [ConfigModule, AuthModule],
+  controllers: [MosaicTelemetryController],
+  providers: [MosaicTelemetryService, PredictionService],
+  exports: [MosaicTelemetryService, PredictionService],
 })
 export class MosaicTelemetryModule {}