feat: migrate runtime backend to node server

server-node/src/logging.ts

@@ -0,0 +1,65 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+import pino, { type Logger } from 'pino';
+
+import type { AppConfig } from './config.js';
+
+const LOG_RETENTION_DAYS = 7;
+
+function cleanupExpiredLogs(logsDir: string) {
+  if (!fs.existsSync(logsDir)) {
+    return;
+  }
+
+  const expiryTime = Date.now() - LOG_RETENTION_DAYS * 24 * 60 * 60 * 1000;
+
+  for (const entry of fs.readdirSync(logsDir, { withFileTypes: true })) {
+    if (!entry.isFile() || !entry.name.startsWith('server.log')) {
+      continue;
+    }
+
+    const fullPath = path.join(logsDir, entry.name);
+    const stats = fs.statSync(fullPath);
+    if (stats.mtimeMs < expiryTime) {
+      fs.rmSync(fullPath, { force: true });
+    }
+  }
+}
+
+export function createLogger(config: AppConfig): Logger {
+  fs.mkdirSync(config.logsDir, { recursive: true });
+  cleanupExpiredLogs(config.logsDir);
+
+  const transport = pino.transport({
+    targets: [
+      {
+        target: 'pino-roll',
+        level: config.logLevel,
+        options: {
+          file: path.join(config.logsDir, 'server.log'),
+          mkdir: true,
+          size: '10m',
+          frequency: 'daily',
+          dateFormat: 'yyyy-MM-dd',
+        },
+      },
+      {
+        target: 'pino/file',
+        level: config.logLevel,
+        options: {
+          destination: 1,
+        },
+      },
+    ],
+  });
+
+  return pino(
+    {
+      level: config.logLevel,
+      timestamp: pino.stdTimeFunctions.isoTime,
+      base: undefined,
+    },
+    transport,
+  );
+}