feat: Add centralized logging system with @link-stack/logger package

- Create new @link-stack/logger package wrapping Pino for structured logging
- Replace all console.log/error/warn statements across the monorepo
- Configure environment-aware logging (pretty-print in dev, JSON in prod)
- Add automatic redaction of sensitive fields (passwords, tokens, etc.)
- Remove dead commented-out logger file from bridge-worker
- Follow Pino's standard argument order (context object first, message second)
- Support log levels via LOG_LEVEL environment variable
- Export TypeScript types for better IDE support

This provides consistent, structured logging across all applications
and packages, making debugging easier and production logs more parseable.

apps/bridge-worker/lib/common.ts

@@ -3,6 +3,9 @@
 import Twilio from "twilio";
 import { CallInstance } from "twilio/lib/rest/api/v2010/account/call";
 import { Zammad, getOrCreateUser } from "./zammad.js";
+import { createLogger } from "@link-stack/logger";
+
+const logger = createLogger('bridge-worker-common');
 
 type SavedVoiceProvider = any;
 
@@ -63,7 +66,7 @@ export const createZammadTicket = async (
     });
   } catch (error: any) {
     if (error.isBoom) {
-      console.error(error.output);
+      logger.error({ output: error.output }, 'Zammad ticket creation failed');
       throw new Error("Failed to create zamamd ticket");
     }
   }