Initial commit: teaching institution management API.

Express/MongoDB backend with JWT auth, RBAC, S3 uploads, notifications, and scheduled jobs.

utils/logger.js

@@ -0,0 +1,26 @@
+// /utils/logger.js
+
+const winston = require('winston');
+
+const logger = winston.createLogger({
+  level: process.env.LOG_LEVEL || 'info',
+  format: winston.format.combine(
+    winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
+    winston.format.errors({ stack: true }),
+    winston.format.splat(),
+    winston.format.json()
+  ),
+  defaultMeta: { service: 'institution-api' },
+  transports: [
+    new winston.transports.Console({
+      format: winston.format.combine(
+        winston.format.colorize(),
+        winston.format.printf(({ timestamp, level, message, service, stack }) => {
+          return `[${timestamp}] [${level}]: ${stack || message}`;
+        })
+      )
+    })
+  ]
+});
+
+module.exports = logger;