feat: complete issue fixes and implement remaining features

## Critical Issues (CRIT-001~003) - All Fixed
- JWT secret key validation with pydantic field_validator
- Login audit logging for success/failure attempts
- Frontend API path prefix removal

## High Priority Issues (HIGH-001~008) - All Fixed
- Project soft delete using is_active flag
- Redis session token bytes handling
- Rate limiting with slowapi (5 req/min for login)
- Attachment API permission checks
- Kanban view with drag-and-drop
- Workload heatmap UI (WorkloadPage, WorkloadHeatmap)
- TaskDetailModal integrating Comments/Attachments
- UserSelect component for task assignment

## Medium Priority Issues (MED-001~012) - All Fixed
- MED-001~005: DB commits, N+1 queries, datetime, error format, blocker flag
- MED-006: Project health dashboard (HealthService, ProjectHealthPage)
- MED-007: Capacity update API (PUT /api/users/{id}/capacity)
- MED-008: Schedule triggers (cron parsing, deadline reminders)
- MED-009: Watermark feature (image/PDF watermarking)
- MED-010~012: useEffect deps, DOM operations, PDF export

## New Files
- backend/app/api/health/ - Project health API
- backend/app/services/health_service.py
- backend/app/services/trigger_scheduler.py
- backend/app/services/watermark_service.py
- backend/app/core/rate_limiter.py
- frontend/src/pages/ProjectHealthPage.tsx
- frontend/src/components/ProjectHealthCard.tsx
- frontend/src/components/KanbanBoard.tsx
- frontend/src/components/WorkloadHeatmap.tsx

## Tests
- 113 new tests passing (health: 32, users: 14, triggers: 35, watermark: 32)

## OpenSpec Archives
- add-project-health-dashboard
- add-capacity-update-api
- add-schedule-triggers
- add-watermark-feature
- add-rate-limiting
- enhance-frontend-ux
- add-resource-management-ui

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

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

backend/app/core/scheduler.py

@@ -1,9 +1,11 @@
 import logging
 from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from apscheduler.triggers.cron import CronTrigger
+from apscheduler.triggers.interval import IntervalTrigger
 
 from app.core.database import SessionLocal
 from app.services.report_service import ReportService
+from app.services.trigger_scheduler import TriggerSchedulerService
 
 logger = logging.getLogger(__name__)
 
@@ -24,6 +26,24 @@ async def weekly_report_job():
         db.close()
 
 
+async def schedule_trigger_job():
+    """Job function to evaluate and execute schedule triggers.
+
+    This runs every minute and checks:
+    1. Cron-based schedule triggers
+    2. Deadline reminder triggers
+    """
+    db = SessionLocal()
+    try:
+        logs = TriggerSchedulerService.evaluate_schedule_triggers(db)
+        if logs:
+            logger.info(f"Schedule trigger job executed {len(logs)} triggers")
+    except Exception as e:
+        logger.error(f"Error in schedule trigger job: {e}")
+    finally:
+        db.close()
+
+
 def init_scheduler():
     """Initialize the scheduler with jobs."""
     # Weekly report - Every Friday at 16:00
@@ -35,7 +55,16 @@ def init_scheduler():
         replace_existing=True,
     )
 
-    logger.info("Scheduler initialized with weekly report job (Friday 16:00)")
+    # Schedule trigger evaluation - Every minute
+    scheduler.add_job(
+        schedule_trigger_job,
+        IntervalTrigger(minutes=1),
+        id='schedule_triggers',
+        name='Evaluate Schedule Triggers',
+        replace_existing=True,
+    )
+
+    logger.info("Scheduler initialized with jobs: weekly_report (Friday 16:00), schedule_triggers (every minute)")
 
 
 def start_scheduler():