Initial implementation of hdmistat - Linux framebuffer system stats display

Features:
- Beautiful system statistics display using IBM Plex Mono font
- Direct framebuffer rendering without X11/Wayland
- Multiple screens with automatic carousel rotation
- Real-time system monitoring (CPU, memory, disk, network, processes)
- Systemd service integration with install command
- Clean architecture using uber/fx dependency injection

Architecture:
- Cobra CLI with daemon, install, status, and info commands
- Modular design with separate packages for display, rendering, and stats
- Font embedding for zero runtime dependencies
- Layout API for clean text rendering
- Support for multiple screen types (overview, top CPU, top memory)

Technical details:
- Uses gopsutil for cross-platform system stats collection
- Direct Linux framebuffer access via memory mapping
- Anti-aliased text rendering with freetype
- Configurable screen rotation and update intervals
- Structured logging with slog
- Comprehensive test coverage and linting setup

This initial version provides a solid foundation for displaying rich
system information on resource-constrained devices like Raspberry Pis.

Makefile

@@ -0,0 +1,38 @@
+.PHONY: all build test fmt lint clean install
+
+all: fmt lint test build
+
+build:
+	go build -o hdmistat ./cmd/hdmistat
+
+test: fmt lint
+	go test -v ./...
+
+fmt:
+	go fmt ./...
+
+lint:
+	golangci-lint run
+
+clean:
+	rm -f hdmistat
+	go clean
+
+install: build
+	sudo cp hdmistat /usr/local/bin/
+
+# Development helpers
+.PHONY: run run-daemon
+
+run: build
+	./hdmistat
+
+run-daemon: build
+	sudo ./hdmistat daemon
+
+# Dependencies
+.PHONY: deps
+
+deps:
+	go mod download
+	go mod tidy