feat: Phase 6 - System Health & Monitoring complete

- Added SystemHealthController with 6 monitoring endpoints
- Created System Health Dashboard (Index) with real-time metrics
- Implemented Database Performance monitoring with query analysis
- Added API Performance tracking with endpoint usage stats
- Created Server Resources monitoring (CPU/Memory/Disk/Network)
- Implemented Activity Feed with player/combat/purchase/admin events
- Added Error Tracking with trend analysis and stack traces
- Fixed navigation routing from System to SystemHealth controller
- All views use real data from database and system diagnostics
- Dark theme styling consistent across all monitoring pages
- Chart.js visualizations for trends and metrics

Phase 6 Complete - Admin Dashboard fully functional!

ShadowedRealmsMobile/src/server/ShadowedRealms.Admin/appsettings.json

@@ -1,12 +1,87 @@
 {
   "ConnectionStrings": {
-    "DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=aspnet-ShadowedRealms.Admin-6edaa4c8-3d68-44fa-8032-b753cd9ade75;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "DefaultConnection": "Host=209.25.140.218;Port=5432;Database=ShadowedRealms;Username=admin;Password=EWV+UMbQNMJLY5tAIKLZIJvn0Nx40k3PJLcO4Tmkns0=;SSL Mode=Prefer;Trust Server Certificate=true",
+    "GameDatabase": "Host=209.25.140.218;Port=5432;Database=ShadowedRealms;Username=admin;Password=EWV+UMbQNMJLY5tAIKLZIJvn0Nx40k3PJLcO4Tmkns0=;SSL Mode=Prefer;Trust Server Certificate=true"
   },
   "Logging": {
     "LogLevel": {
       "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
-}
+  "AllowedHosts": "*",
+  "DefaultAdmin": {
+    "Email": "admin@shadowedrealms.com",
+    "Password": "SuperAdmin123!"
+  },
+  "AdminSettings": {
+    "RequireEmailConfirmation": false,
+    "SessionTimeoutMinutes": 120,
+    "MaxFailedLoginAttempts": 3,
+    "LockoutDurationMinutes": 30,
+    "EnableAuditLogging": true,
+    "EnableRealTimeUpdates": true,
+    "DashboardRefreshIntervalSeconds": 30
+  },
+  "MonitoringSettings": {
+    "HealthCheckIntervalSeconds": 60,
+    "AlertThresholds": {
+      "DatabaseResponseTimeMs": 1000,
+      "ApiResponseTimeMs": 500,
+      "ErrorRate24h": 0.01,
+      "CpuUsagePercent": 80,
+      "MemoryUsagePercent": 85,
+      "DiskUsagePercent": 90
+    },
+    "RetentionDays": {
+      "ActivityLogs": 90,
+      "PerformanceMetrics": 30,
+      "Alerts": 180
+    }
+  },
+  "AnalyticsSettings": {
+    "CacheExpirationMinutes": 15,
+    "TrendAnalysisDays": 30,
+    "HeavyQueryCacheMinutes": 60,
+    "RealTimeMetricsCacheSeconds": 30
+  },
+  "SecuritySettings": {
+    "EnableIpWhitelist": false,
+    "AllowedIpAddresses": [],
+    "RequireTwoFactorAuth": false,
+    "AuditAllActions": true,
+    "SessionSecurityLevel": "High"
+  },
+  "GameIntegrationSettings": {
+    "GameApiBaseUrl": "https://localhost:7001/api/",
+    "GameApiTimeout": 30,
+    "EnableDirectDatabaseAccess": true,
+    "KingdomScopedQueries": true
+  },
+  "Serilog": {
+    "Using": [ "Serilog.Sinks.Console", "Serilog.Sinks.File" ],
+    "MinimumLevel": "Information",
+    "WriteTo": [
+      {
+        "Name": "Console",
+        "Args": {
+          "outputTemplate": "[{Timestamp:HH:mm:ss} {Level:u3}] {SourceContext}: {Message:lj}{NewLine}{Exception}"
+        }
+      },
+      {
+        "Name": "File",
+        "Args": {
+          "path": "Logs/admin-{Date}.log",
+          "rollingInterval": "Day",
+          "retainedFileCountLimit": 30,
+          "outputTemplate": "[{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} {Level:u3}] {SourceContext}: {Message:lj}{NewLine}{Exception}"
+        }
+      }
+    ],
+    "Enrich": [ "FromLogContext", "WithMachineName" ],
+    "Properties": {
+      "Application": "ShadowedRealms.Admin"
+    }
+  }
+}