feat: Add base HTML template and implement dashboard, logs, and service views

- Created a base HTML template for consistent layout across pages.
- Developed a dashboard page to display backup service metrics and statuses.
- Implemented a log viewer for detailed log file inspection.
- Added error handling page for better user experience during failures.
- Introduced service detail page to show specific service metrics and actions.
- Enhanced log filtering and viewing capabilities.
- Integrated auto-refresh functionality for real-time updates on metrics.
- Created integration and unit test scripts for backup metrics functionality.

docs/cleanup-completion-summary.md

@@ -0,0 +1,106 @@
+# Cleanup Completion Summary: Simplified Metrics System
+
+## Overview
+
+Completed the final cleanup phase of the simplified unified backup metrics system implementation. All outdated files and references to the complex system have been deprecated or updated.
+
+## Actions Performed
+
+### 1. Deprecated Outdated Files
+
+- **`docs/json-metrics-integration-guide.md`** → `docs/json-metrics-integration-guide.md.deprecated`
+  - Contained instructions for the old complex JSON logging system
+  - Now deprecated since we use the simplified metrics system
+
+- **`lib/backup-json-logger.sh`** → `lib/backup-json-logger.sh.deprecated`
+  - Old complex JSON logging library (748 lines)
+  - Replaced by simplified `lib/unified-backup-metrics.sh` (252 lines)
+
+### 2. Updated Example Scripts
+
+- **`examples/plex-backup-with-json.sh`** → `examples/plex-backup-with-metrics.sh`
+  - Updated to use simplified metrics functions
+  - Removed complex session management and timing phases
+  - Updated function calls:
+    - `json_backup_init()` → `metrics_backup_start()`
+    - `json_backup_update_status()` → `metrics_update_status()`
+    - `json_backup_add_file()` → `metrics_file_backup_complete()`
+    - `json_backup_complete()` → `metrics_backup_complete()`
+    - `json_get_current_status()` → `metrics_get_status()`
+
+### 3. Function Mapping
+
+| Old Complex System | New Simplified System |
+|-------------------|----------------------|
+| `json_backup_init()` | `metrics_backup_start()` |
+| `json_backup_start()` | (Integrated into `metrics_backup_start()`) |
+| `json_backup_update_status()` | `metrics_update_status()` |
+| `json_backup_add_file()` | `metrics_file_backup_complete()` |
+| `json_backup_complete()` | `metrics_backup_complete()` |
+| `json_backup_time_phase()` | (Removed - simplified timing) |
+| `json_backup_error()` | (Integrated into status updates) |
+| `json_get_current_status()` | `metrics_get_status()` |
+
+## Current System State
+
+### Active Files
+- ✅ **`lib/unified-backup-metrics.sh`** - Main simplified metrics library
+- ✅ **`backup-web-app.py`** - Updated for new JSON format
+- ✅ **`docs/simplified-metrics-system.md`** - Current documentation
+- ✅ **`examples/plex-backup-with-metrics.sh`** - Updated example
+
+### Production Scripts (Already Updated)
+- ✅ **`backup-media.sh`** - Uses simplified metrics
+- ✅ **`backup-env-files.sh`** - Uses simplified metrics  
+- ✅ **`backup-docker.sh`** - Uses simplified metrics
+
+### Deprecated Files
+- 🗃️ **`docs/json-metrics-integration-guide.md.deprecated`**
+- 🗃️ **`lib/backup-json-logger.sh.deprecated`**
+- 🗃️ **`lib/unified-backup-metrics-complex.sh.backup`**
+
+## Benefits Achieved
+
+1. **Simplified Integration**: Single function call to start metrics tracking
+2. **Reduced Complexity**: Removed session management, complex timing, and atomic writes
+3. **Maintained Compatibility**: Legacy function names still work via compatibility layer
+4. **Clear Documentation**: Updated example shows simple integration pattern
+5. **Consistent Naming**: All references now use "metrics" terminology consistently
+
+## Current Metrics Format
+
+Each service now creates a simple JSON status file:
+
+```json
+{
+  "service": "plex",
+  "description": "Plex Media Server backup",
+  "start_time": "2025-06-18T10:30:00Z",
+  "end_time": "2025-06-18T10:45:00Z",
+  "status": "success",
+  "current_operation": "Backup completed",
+  "total_files": 3,
+  "total_size": 2048576,
+  "error_message": null
+}
+```
+
+## Next Steps
+
+The simplified metrics system is now fully implemented and cleaned up. The system is ready for production use with:
+
+- ✅ Minimal performance overhead
+- ✅ Easy debugging and maintenance
+- ✅ Web interface compatibility
+- ✅ Backward compatibility with existing scripts
+- ✅ Clear documentation and examples
+
+## Validation
+
+All components have been tested and validated:
+- Simplified metrics library functions correctly
+- Web application reads the new format
+- Example script demonstrates proper integration
+- No references to deprecated systems remain in active code
+
+The transition to the simplified unified backup metrics system is now complete.