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/leafcutter/pages/api/proxy/[[...path]].ts

@@ -1,6 +1,9 @@
 import { createProxyMiddleware } from "http-proxy-middleware";
 import { NextApiRequest, NextApiResponse } from "next";
 import { getToken } from "next-auth/jwt";
+import { createLogger } from "@link-stack/logger";
+
+const logger = createLogger('leafcutter-[[...path]]');
 
 /*
 
@@ -30,11 +33,11 @@ const withAuthInfo =
     );
 
     if (requestSignature && isAppPath) {
-      console.info("Has Signature");
+      logger.info("Has Signature");
     }
 
     if (referrerSignature && isResourcePath) {
-      console.info("Has Signature");
+      logger.info("Has Signature");
     }
 
     if (!email) {