Refactor hdmistat to use dependency injection and fix linter issues

Major changes:
- Converted all cobra commands from global variables to CLI struct methods
- Eliminated global logger variable in favor of dependency injection
- Fixed all errcheck linter issues by properly handling errors
- Fixed Makefile to check formatting instead of modifying files
- Integrated smartconfig library for configuration management
- Added CLAUDE.md with project-specific development guidelines

Key improvements:
- All commands (daemon, install, status, info) now use CLI struct methods
- Logger is injected as dependency through fx providers
- Proper error handling for all DrawText and file.Close() calls
- Configuration loading now uses smartconfig with proper defaults
- Fixed formatting check in Makefile (make test no longer modifies files)

Technical details:
- Created CLI struct with log field (renamed from logger per request)
- All command constructors return *cobra.Command from CLI methods
- Config package uses smartconfig.NewFromAppName() correctly
- Fixed all critical errcheck issues throughout the codebase
- Maintained backward compatibility with existing functionality

All tests passing, code formatted, and ready for deployment.

Makefile

@@ -5,12 +5,16 @@ all: fmt lint test build
 build:
 	go build -o hdmistat ./cmd/hdmistat
 
-test: fmt lint
+test: fmt-check lint
 	go test -v ./...
 
 fmt:
 	go fmt ./...
 
+fmt-check:
+	@echo "Checking formatting..."
+	@test -z "$$(gofmt -l .)" || (echo "Files need formatting. Run 'make fmt'" && gofmt -l . && exit 1)
+
 lint:
 	golangci-lint run