feat: implement automation module

- Event-based triggers (Phase 1):
  - Trigger/TriggerLog models with field_change type
  - TriggerService for condition evaluation and action execution
  - Trigger CRUD API endpoints
  - Task integration (status, assignee, priority changes)
  - Frontend: TriggerList, TriggerForm components

- Weekly reports (Phase 2):
  - ScheduledReport/ReportHistory models
  - ReportService for stats generation
  - APScheduler for Friday 16:00 job
  - Report preview/generate/history API
  - Frontend: WeeklyReportPreview, ReportHistory components

- Tests: 23 new tests (14 triggers + 9 reports)
- OpenSpec: add-automation change archived

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

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

backend/app/main.py

@@ -1,7 +1,19 @@
+from contextlib import asynccontextmanager
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.middleware.audit import AuditMiddleware
+from app.core.scheduler import start_scheduler, shutdown_scheduler
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Manage application lifespan events."""
+    # Startup
+    start_scheduler()
+    yield
+    # Shutdown
+    shutdown_scheduler()
 from app.api.auth import router as auth_router
 from app.api.users import router as users_router
 from app.api.departments import router as departments_router
@@ -15,12 +27,15 @@ from app.api.blockers import router as blockers_router
 from app.api.websocket import router as websocket_router
 from app.api.audit import router as audit_router
 from app.api.attachments import router as attachments_router
+from app.api.triggers import router as triggers_router
+from app.api.reports import router as reports_router
 from app.core.config import settings
 
 app = FastAPI(
     title="Project Control API",
     description="Cross-departmental project management system API",
     version="0.1.0",
+    lifespan=lifespan,
 )
 
 # CORS middleware
@@ -49,6 +64,8 @@ app.include_router(blockers_router)
 app.include_router(websocket_router)
 app.include_router(audit_router)
 app.include_router(attachments_router)
+app.include_router(triggers_router)
+app.include_router(reports_router)
 
 
 @app.get("/health")