feat: add nodemon configuration for email-worker development

Configure nodemon to automatically load environment variables from .env file
using dotenv/config preload. This ensures all environment variables are available
during development without manual loading.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

email-worker/nodemon.json

@@ -0,0 +1,7 @@
+{
+  "watch": ["src"],
+  "ext": "ts",
+  "execMap": {
+    "ts": "node -r dotenv/config -r ts-node/register"
+  }
+}