Initial commit: JMon cross-platform monitoring system

- gRPC client-server metrics collection
- PeriodicTimer-based 5-second sampling
- Delta encoding with configurable thresholds
- Queue/retry mechanism for resilience
- ProcessId tracking for duplicate detection
- Server-side state reconstruction
- Native AOT compilation support
- Docker/Podman containerization
- PostgreSQL + TimescaleDB persistence layer

JMonAgent/appsettings.json

@@ -0,0 +1,10 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Debug",
+      "Microsoft.Hosting.Lifetime": "Information",
+      "Microsoft.AspNetCore.SignalR": "Debug",
+      "Microsoft.AspNetCore.Http.Connections": "Debug"
+    }
+  }
+}