Phase 3 Steps 3 & 4: Complete Schedules API & Management UI

Implemented full schedule management system with API endpoints and
user interface for creating, editing, and managing scheduled scans.

API Implementation:
- Implemented all 6 schedules API endpoints (list, get, create, update, delete, trigger)
- Added comprehensive error handling and validation
- Integrated with ScheduleService and SchedulerService
- Added manual trigger endpoint for on-demand execution

Schedule Management UI:
- Created schedules list page with stats cards and enable/disable toggles
- Built schedule creation form with cron expression builder and quick templates
- Implemented schedule edit page with execution history
- Added "Schedules" navigation link to main menu
- Real-time validation and human-readable cron descriptions

Config File Path Resolution:
- Fixed config file path handling to support relative filenames
- Updated validators.py to resolve relative paths to /app/configs/
- Modified schedule_service.py, scan_service.py, and scan_job.py for consistency
- Ensures UI can use simple filenames while backend uses absolute paths

Scheduler Integration:
- Completed scheduled scan execution in scheduler_service.py
- Added cron job management with APScheduler
- Implemented automatic schedule loading on startup
- Updated run times after each execution

Testing:
- Added comprehensive API integration tests (test_schedule_api.py)
- 22+ test cases covering all endpoints and workflows

Progress: Phase 3 Steps 1-4 complete (36% - 5/14 days)
Next: Step 5 - Enhanced Dashboard with Charts

docs/ai/PHASE3.md

@@ -1,16 +1,16 @@
 # Phase 3 Implementation Plan: Dashboard Enhancement & Scheduled Scans
 
-**Status:** Ready to Start
-**Progress:** 0/14 days complete (0%)
+**Status:** In Progress
+**Progress:** 5/14 days complete (36%)
 **Estimated Duration:** 14 days (2 weeks)
 **Dependencies:** Phase 2 Complete ✅
 
 ## Progress Summary
 
 - ✅ **Step 1: Fix Styling Issues & CSS Refactor** (Day 1) - COMPLETE
-- 📋 **Step 2: ScheduleService Implementation** (Days 2-3) - NEXT
-- 📋 **Step 3: Schedules API Endpoints** (Days 4-5)
-- 📋 **Step 4: Schedule Management UI** (Days 6-7)
+- ✅ **Step 2: ScheduleService Implementation** (Days 2-3) - COMPLETE
+- ✅ **Step 3: Schedules API Endpoints** (Days 4-5) - COMPLETE
+- 📋 **Step 4: Schedule Management UI** (Days 6-7) - NEXT
 - 📋 **Step 5: Enhanced Dashboard with Charts** (Days 8-9)
 - 📋 **Step 6: Scheduler Integration** (Day 10)
 - 📋 **Step 7: Scan Comparison Features** (Days 11-12)