Initial commit: uskey - macOS keyboard remapper

Features:
- Menu bar GUI with enable/disable toggle
- JSON-based configuration system
- File-based logging with debug support
- CGEventTap-based key remapping
- Custom app icon support
- DMG installer packaging

Core Components:
- AppDelegate: Application lifecycle and initialization
- EventTapManager: Event tap creation and management with proper pointer lifetime
- KeyMapper: Key mapping logic and configuration loading
- StatusBarController: Menu bar UI and user interactions
- Logger: File and console logging with configurable levels
- Config: JSON configuration parser with default creation

Build System:
- build-app.sh: Creates macOS .app bundle with icon
- build-dmg.sh: Generates distributable DMG installer
- create-icon.sh: Converts PNG to .icns format

Documentation:
- README.md: User guide and troubleshooting
- BUILD.md: Build instructions and packaging
- DEBUG.md: Debugging guide with log access

🤖 Generated with [Qoder](https://qoder.com)

Sources/KeyMapper.swift

@@ -0,0 +1,47 @@
+@preconcurrency import Foundation
+@preconcurrency import CoreGraphics
+
+struct KeyMapper {
+    private var mappings: [Int64: Int64] = [:]
+    
+    init() {
+    }
+    
+    init(fromConfig config: Config) {
+        loadFromConfig(config)
+    }
+    
+    mutating func loadFromConfig(_ config: Config) {
+        mappings.removeAll()
+        for (from, to) in config.mapping.getAllMappings() {
+            mappings[from] = to
+            Logger.debug("Loaded mapping: \(from) -> \(to)")
+        }
+    }
+    
+    mutating func addMapping(from: Int64, to: Int64) {
+        mappings[from] = to
+    }
+    
+    mutating func removeMapping(from: Int64) {
+        mappings.removeValue(forKey: from)
+    }
+    
+    func getMappedKey(for keyCode: Int64) -> Int64? {
+        return mappings[keyCode]
+    }
+    
+    func hasMappingFor(keyCode: Int64) -> Bool {
+        return mappings[keyCode] != nil
+    }
+    
+    func printMappings() {
+        Logger.info("")
+        Logger.info("Current key mappings:")
+        Logger.info("====================")
+        for (from, to) in mappings.sorted(by: { $0.key < $1.key }) {
+            Logger.info("  \(from) -> \(to)")
+        }
+        Logger.info("")
+    }
+}