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

web/routes/main.py

@@ -66,3 +66,59 @@ def scan_detail(scan_id):
     """
     # TODO: Phase 5 - Implement scan detail page
     return render_template('scan_detail.html', scan_id=scan_id)
+
+
+@bp.route('/schedules')
+@login_required
+def schedules():
+    """
+    Schedules list page - shows all scheduled scans.
+
+    Returns:
+        Rendered schedules list template
+    """
+    return render_template('schedules.html')
+
+
+@bp.route('/schedules/create')
+@login_required
+def create_schedule():
+    """
+    Create new schedule form page.
+
+    Returns:
+        Rendered schedule create template with available config files
+    """
+    import os
+
+    # Get list of available config files
+    configs_dir = '/app/configs'
+    config_files = []
+
+    try:
+        if os.path.exists(configs_dir):
+            config_files = [f for f in os.listdir(configs_dir) if f.endswith('.yaml')]
+            config_files.sort()
+    except Exception as e:
+        logger.error(f"Error listing config files: {e}")
+
+    return render_template('schedule_create.html', config_files=config_files)
+
+
+@bp.route('/schedules/<int:schedule_id>/edit')
+@login_required
+def edit_schedule(schedule_id):
+    """
+    Edit existing schedule form page.
+
+    Args:
+        schedule_id: Schedule ID to edit
+
+    Returns:
+        Rendered schedule edit template
+    """
+    from flask import flash
+
+    # Note: Schedule data is loaded via AJAX in the template
+    # This just renders the page with the schedule_id in the URL
+    return render_template('schedule_edit.html', schedule_id=schedule_id)