feat(infrastructure): update queue worker

backend/app/workers/email_handler.py

@@ -0,0 +1,29 @@
+import asyncio
+from typing import Any, Dict
+
+# Import decorator and logger from the worker so handlers can register themselves
+from .queue_worker import register_task_handler, logger
+
+
+@register_task_handler("email")
+async def handle_email_task(payload: Dict[str, Any]) -> None:
+    """Handle 'email' tasks dispatched by the queue worker.
+
+    Expected payload schema:
+    {
+        "type": "email",
+        "to": "recipient@example.com",
+        "subject": "Subject text",
+        "body": "Email body text"
+    }
+    """
+    to = payload.get("to")
+    subject = payload.get("subject")
+    body = payload.get("body")
+    if not (to and subject and body):
+        logger.error("Email task missing fields. Payload: %s", payload)
+        return
+
+    # Placeholder for real email sending logic
+    await asyncio.sleep(0)  # yield control, simulate async work
+    logger.info("Email sent | to=%s | subject=%s | body_len=%d", to, subject, len(body))