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.

packages/logger/package.json

@@ -0,0 +1,36 @@
+{
+  "name": "@link-stack/logger",
+  "version": "1.0.0",
+  "description": "Shared logging utility for Link Stack monorepo",
+  "main": "./dist/index.js",
+  "module": "./dist/index.mjs",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.js",
+      "import": "./dist/index.mjs",
+      "types": "./dist/index.d.ts"
+    }
+  },
+  "scripts": {
+    "build": "tsup src/index.ts --format cjs,esm --dts --clean",
+    "dev": "tsup src/index.ts --format cjs,esm --dts --watch",
+    "lint": "eslint . --ext .ts",
+    "type-check": "tsc --noEmit"
+  },
+  "dependencies": {
+    "pino": "^9.5.0",
+    "pino-pretty": "^13.0.0"
+  },
+  "devDependencies": {
+    "@link-stack/eslint-config": "*",
+    "@link-stack/typescript-config": "*",
+    "@types/node": "^22.10.5",
+    "eslint": "^9.17.0",
+    "tsup": "^8.3.5",
+    "typescript": "^5.7.3"
+  },
+  "publishConfig": {
+    "access": "public"
+  }
+}