fix(fastify-core,mcp-server): add logLevel to ServiceAppOptions and wire config.LOG_LEVEL so log verbosity is actually honoured at runtime

packages/fastify-core/src/create-app.ts

@@ -26,9 +26,20 @@ import type { ServiceAppOptions, FastifyApp } from './types.js';
  * ```
  */
 export async function createServiceApp(options: ServiceAppOptions): Promise<FastifyApp> {
-  const { name, version, description, corsOrigin, logger = true, swagger, metrics } = options;
+  const {
+    name,
+    version,
+    description,
+    corsOrigin,
+    logger = true,
+    logLevel,
+    swagger,
+    metrics,
+  } = options;
 
-  const app = Fastify({ logger });
+  const app = Fastify({
+    logger: logger ? (logLevel ? { level: logLevel } : true) : false,
+  });
 
   // CORS — deny all origins when CORS_ORIGIN is not explicitly set
   const origin = corsOrigin ? corsOrigin.split(',').map(o => o.trim()) : false;

packages/fastify-core/src/types.ts

@@ -12,6 +12,7 @@ export interface ServiceAppOptions {
   description?: string;
   corsOrigin?: string;
   logger?: boolean;
+  logLevel?: 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'fatal';
   swagger?: SwaggerOptions;
   metrics?: boolean;
 }

services/mcp-server/src/server.ts

@@ -30,6 +30,7 @@ const app = await createServiceApp({
   description:
     'ByteLyst MCP Server — platform.telemetry.*, platform.diagnostics.*, extraction.*, support.*',
   corsOrigin: config.CORS_ORIGIN,
+  logLevel: config.LOG_LEVEL,
 });
 
 // Parse JWT on every request (best-effort)