feat(server): migrate all logging to pino

- Add pino with pino-pretty for structured logging
- Create root logger in index.ts with child loggers per module
- Support log level via PASEO_LOG env var and config.json
- Support log format (pretty/json) via PASEO_LOG_FORMAT and config.json
- Replace all console.* in runtime code with appropriate log levels
- Scripts use process.stdout/stderr for output
- Error logging uses correct pattern: logger.error({ err }, msg)

packages/server/package.json

@@ -39,6 +39,8 @@
     "express-basic-auth": "^1.2.1",
     "mnemonic-id": "^3.2.7",
     "openai": "^4.20.0",
+    "pino": "^10.2.0",
+    "pino-pretty": "^13.1.3",
     "playwright": "^1.56.1",
     "tiny-invariant": "^1.3.3",
     "uuid": "^9.0.1",