Add project scaffolding and documentation

Add .env.example with configuration for database, Redis, security, SMTP, workers, and plugins. Add .gitignore for Python, Node.js, Next.js, Docker volumes, and IDE files. Add MIT License. Update README.md with feature overview, quick start guide, architecture description, plugin system documentation, security details, backup/restore instructions, and developer setup. Add Alembic configuration files and placeholder directories for API, web, worker, and plugin components

apps/worker/src/tasks.py

@@ -0,0 +1,48 @@
+import asyncio
+import uuid
+from datetime import datetime, timezone
+
+from apps.api.src.database import AsyncSessionLocal
+from apps.api.src.models.background_job import BackgroundJob
+from apps.api.src.plugins import loader
+from apps.api.src.services import plugin_service
+from apps.worker.src.celery_app import celery_app
+
+
+@celery_app.task(bind=True, max_retries=3)
+def run_plugin_sync(self, instance_id: str) -> dict:
+    try:
+        result = asyncio.run(_async_run_plugin_sync(instance_id))
+        return result
+    except Exception as exc:
+        raise self.retry(exc=exc, countdown=60)
+
+
+async def _async_run_plugin_sync(instance_id: str) -> dict:
+    async with AsyncSessionLocal() as db:
+        try:
+            instance_uuid = uuid.UUID(instance_id)
+            result = await loader.run_healthcheck(db, instance_uuid)
+
+            # Update sync timestamp
+            instance = await plugin_service.get_instance(db, instance_uuid)
+            if instance:
+                instance.last_sync_at = datetime.now(timezone.utc)  # type: ignore
+                await db.commit()
+
+            # Record job
+            job = BackgroundJob(
+                task_name="plugin_sync",
+                status="completed" if result.get("status") == "ok" else "failed",
+                payload={"instance_id": instance_id},
+                result=result,
+                plugin_id=instance.plugin_id if instance else None,
+                instance_id=instance_uuid,
+                scheduled_at=datetime.now(timezone.utc),  # type: ignore
+            )
+            db.add(job)
+            await db.commit()
+            return result
+        except Exception as e:
+            await db.rollback()
+            raise e