chore: add development configuration files

Add .env with default development settings and .vscode debug configurations for easier local development.

- .env: Development environment variables (PORT, DEBUG, PULL_INTERVAL)
- .vscode/launch.json: Debug configurations for server and Jest tests
- .vscode/settings.json: Jest integration settings

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

email-server-worker/.env

@@ -0,0 +1,9 @@
+DEBUG=server:server
+
+ENV=dev
+
+# podešen port koji se neće kršiti sa web5-main
+PORT="3001"
+
+# run job every 60 seconds
+PULL_INTERVAL=60000