feat: Add comprehensive provider health monitoring and failover system

- Implemented ProviderHealthMonitor for real-time tracking
  - Monitors availability, response times, success rates
  - Automatic marking unavailable after failures
  - Background health check loop

- Added ProviderFailover for automatic provider switching
  - Configurable retry attempts with exponential backoff
  - Integration with health monitoring
  - Smart provider selection

- Created MonitoredProviderWrapper for performance tracking
  - Transparent monitoring for any provider
  - Automatic metric recording
  - No changes needed to existing providers

- Implemented ProviderConfigManager for dynamic configuration
  - Runtime updates without restart
  - Per-provider settings (timeout, retries, bandwidth)
  - JSON-based persistence

- Added Provider Management API (15+ endpoints)
  - Health monitoring endpoints
  - Configuration management
  - Failover control

- Comprehensive testing (34 tests, 100% pass rate)
  - Health monitoring tests
  - Failover scenario tests
  - Configuration management tests

- Documentation updates
  - Updated infrastructure.md
  - Updated instructions.md
  - Created PROVIDER_ENHANCEMENT_SUMMARY.md

Total: ~2,593 lines of code, 34 passing tests

data/config_backups/config_backup_20251024_103444.json

@@ -0,0 +1,21 @@
+{
+  "name": "Aniworld",
+  "data_dir": "data",
+  "scheduler": {
+    "enabled": true,
+    "interval_minutes": 60
+  },
+  "logging": {
+    "level": "INFO",
+    "file": null,
+    "max_bytes": null,
+    "backup_count": 3
+  },
+  "backup": {
+    "enabled": false,
+    "path": "data/backups",
+    "keep_days": 30
+  },
+  "other": {},
+  "version": "1.0.0"
+}

data/config_backups/config_backup_20251024_104025.json

@@ -0,0 +1,21 @@
+{
+  "name": "Aniworld",
+  "data_dir": "data",
+  "scheduler": {
+    "enabled": true,
+    "interval_minutes": 60
+  },
+  "logging": {
+    "level": "INFO",
+    "file": null,
+    "max_bytes": null,
+    "backup_count": 3
+  },
+  "backup": {
+    "enabled": false,
+    "path": "data/backups",
+    "keep_days": 30
+  },
+  "other": {},
+  "version": "1.0.0"
+}

data/config_backups/config_backup_20251024_104130.json

@@ -0,0 +1,21 @@
+{
+  "name": "Aniworld",
+  "data_dir": "data",
+  "scheduler": {
+    "enabled": true,
+    "interval_minutes": 60
+  },
+  "logging": {
+    "level": "INFO",
+    "file": null,
+    "max_bytes": null,
+    "backup_count": 3
+  },
+  "backup": {
+    "enabled": false,
+    "path": "data/backups",
+    "keep_days": 30
+  },
+  "other": {},
+  "version": "1.0.0"
+}

data/config_backups/config_backup_20251024_104936.json

@@ -0,0 +1,21 @@
+{
+  "name": "Aniworld",
+  "data_dir": "data",
+  "scheduler": {
+    "enabled": true,
+    "interval_minutes": 60
+  },
+  "logging": {
+    "level": "INFO",
+    "file": null,
+    "max_bytes": null,
+    "backup_count": 3
+  },
+  "backup": {
+    "enabled": false,
+    "path": "data/backups",
+    "keep_days": 30
+  },
+  "other": {},
+  "version": "1.0.0"
+}