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/services/schedule_service.py

@@ -64,7 +64,13 @@ class ScheduleService:
             raise ValueError(f"Invalid cron expression: {error_msg}")
 
         # Validate config file exists
-        if not os.path.isfile(config_file):
+        # If config_file is just a filename, prepend the configs directory
+        if not config_file.startswith('/'):
+            config_file_path = os.path.join('/app/configs', config_file)
+        else:
+            config_file_path = config_file
+
+        if not os.path.isfile(config_file_path):
             raise ValueError(f"Config file not found: {config_file}")
 
         # Calculate next run time
@@ -196,7 +202,14 @@ class ScheduleService:
 
         # Validate config file if being updated
         if 'config_file' in updates:
-            if not os.path.isfile(updates['config_file']):
+            config_file = updates['config_file']
+            # If config_file is just a filename, prepend the configs directory
+            if not config_file.startswith('/'):
+                config_file_path = os.path.join('/app/configs', config_file)
+            else:
+                config_file_path = config_file
+
+            if not os.path.isfile(config_file_path):
                 raise ValueError(f"Config file not found: {updates['config_file']}")
 
         # Handle enabled toggle