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/utils.ts

@@ -1,3 +1,7 @@
+import { createLogger } from "@link-stack/logger";
+
+const logger = createLogger('link-utils');
+
 export const fetchLeafcutter = async (url: string, options: any) => {
   /*
 
@@ -13,7 +17,7 @@ export const fetchLeafcutter = async (url: string, options: any) => {
       const json = await res.json();
       return json;
     } catch (error) {
-      console.error({ error });
+      logger.error({ error }, "Error occurred");
       return null;
     }
   };