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/tasks/whatsapp/send-whatsapp-message.ts

@@ -1,4 +1,7 @@
 import { db } from "@link-stack/bridge-common";
+import { createLogger } from "@link-stack/logger";
+
+const logger = createLogger('bridge-worker-send-whatsapp-message');
 
 interface SendWhatsappMessageTaskOptions {
   token: string;
@@ -26,7 +29,7 @@ const sendWhatsappMessageTask = async ({
       body: JSON.stringify(params),
     });
   } catch (error) {
-    console.error({ error });
+    logger.error({ error });
     throw new Error("Failed to send message");
   }
 };