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/templates/base.html

@@ -49,6 +49,10 @@
                         <a class="nav-link {% if request.endpoint == 'main.scans' %}active{% endif %}"
                            href="{{ url_for('main.scans') }}">Scans</a>
                     </li>
+                    <li class="nav-item">
+                        <a class="nav-link {% if request.endpoint and 'schedule' in request.endpoint %}active{% endif %}"
+                           href="{{ url_for('main.schedules') }}">Schedules</a>
+                    </li>
                 </ul>
                 <ul class="navbar-nav">
                     <li class="nav-item">