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/link/app/_lib/authentication.ts

@@ -12,6 +12,9 @@ import Credentials from "next-auth/providers/credentials";
 import Apple from "next-auth/providers/apple";
 import { Redis } from "ioredis";
 import AzureADProvider from "next-auth/providers/azure-ad";
+import { createLogger } from "@link-stack/logger";
+
+const logger = createLogger('link-authentication');
 
 const headers = { Authorization: `Token ${process.env.ZAMMAD_API_TOKEN}` };
 
@@ -48,7 +51,7 @@ const getUserRoles = async (email: string) => {
     });
     return roles.filter((role: string) => role !== null);
   } catch (e) {
-    console.error({ e });
+    logger.error({ error: e, email }, 'Failed to get user roles');
     return [];
   }
 };