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/app/_lib/auth.ts

@@ -3,6 +3,9 @@ import Google from "next-auth/providers/google";
 import Apple from "next-auth/providers/apple";
 import Credentials from "next-auth/providers/credentials";
 import { checkAuth } from "./opensearch";
+import { createLogger } from "@link-stack/logger";
+
+const logger = createLogger('leafcutter-auth');
 
 export const authOptions: NextAuthOptions = {
   pages: {
@@ -45,7 +48,7 @@ export const authOptions: NextAuthOptions = {
 
           return user;
         } catch (e) {
-          console.error({ e });
+          logger.error({ e });
         }
 
         return null;

apps/leafcutter/app/_lib/opensearch.ts

@@ -1,6 +1,9 @@
 /* eslint-disable no-underscore-dangle */
 import { Client } from "@opensearch-project/opensearch";
 import { v4 as uuid } from "uuid";
+import { createLogger } from "@link-stack/logger";
+
+const logger = createLogger('leafcutter-opensearch');
 
 /* Common */
 
@@ -302,7 +305,7 @@ export const updateUserVisualization = async (
       body,
     });
   } catch (e) {
-    console.error({ e });
+    logger.error({ e });
   }
 
   return id;

apps/leafcutter/app/api/upload/index.ts

@@ -4,6 +4,9 @@ import { Client } from "@opensearch-project/opensearch";
 import { v4 as uuid } from "uuid";
 import taxonomy from "app/_config/taxonomy.json";
 import unRegions from "app/_config/unRegions.json";
+import { createLogger } from "@link-stack/logger";
+
+const logger = createLogger('leafcutter-index');
 
 export const POST = async (req: NextRequest) => {
   const { tickets } = await req.json();
@@ -46,7 +49,7 @@ export const POST = async (req: NextRequest) => {
       });
       succeeded.push(id);
     } catch (e) {
-      console.error(e);
+      logger.error(e);
       failed.push(id);
     }
   }