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

.gitignore

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+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# Visual Studio cache/options
+.vs/
+.vscode/
+*.user
+*.userosscache
+*.sln.docstates
+
+# NuGet
+*.nupkg
+*.snupkg
+.nuget/
+
+# Rider
+.idea/
+*.sln.iml
+.idea_modules/
+
+# macOS
+.DS_Store
+
+# Environment variables
+.env
+.env.local
+.env.*.local
+
+# Runtime
+*.dll
+*.exe
+*.so
+*.dylib
+
+# Certificates/Keys
+*.pfx
+*.pem
+*.key
+*.crt
+
+# Local publish artifacts
+/publish/
+/PublishProfiles/
+
+# Node (if used for tooling)
+node_modules/
+
+# Temporary files
+*.tmp
+*.temp
+*.log
+*.swp
+*.swo
+
+# Docker
+.docker/
+docker-compose.override.yml
+
+# Podman
+.podman/
+
+# Tests
+TestResults/
+.coverage/
+coverage/
+
+# IDE Settings (keep only workspace settings, not user settings)
+.vscode/settings.json
+.vscode/launch.json
+.vscode/tasks.json
+
+# Protocol Buffer generated files (keep source .proto files)
+*.pb.go
+*.pb.cs
+
+# OS files
+Thumbs.db
+.Thumbs.db