ems-core v1.0.0: Standard EMS platform core

Shared backend + frontend for multi-customer EMS deployments.
- 12 enterprise modules: quota, cost, charging, maintenance, analysis, etc.
- 120+ API endpoints, 37 database tables
- Customer config mechanism (CUSTOMER env var + YAML config)
- Collectors: Modbus TCP, MQTT, HTTP API, Sungrow iSolarCloud
- Frontend: React 19 + Ant Design + ECharts + Three.js
- Infrastructure: Redis cache, rate limiting, aggregation engine

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/tasks/__init__.py

@@ -0,0 +1,6 @@
+from app.tasks.report_tasks import run_report_sync, REPORT_TYPE_METHODS
+
+try:
+    from app.tasks.report_tasks import generate_report_task, CELERY_AVAILABLE
+except ImportError:
+    CELERY_AVAILABLE = False