feat: add Wails runtime library and initial application setup

- Created package.json for Wails JavaScript runtime library.
- Added TypeScript definitions for runtime functions.
- Implemented runtime.js with event handling and logging functions.
- Initialized Go module with dependencies for Wails and other libraries.
- Added main.go for application entry point and asset embedding.
- Configured wails.json for application settings and build commands.

app.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"sysmon/backend"
+)
+
+// App struct
+type App struct {
+	ctx context.Context
+	sys *backend.SysInfo
+}
+
+// NewApp creates a new App application struct
+func NewApp() *App {
+	return &App{}
+}
+
+// startup is called when the app starts. The context is saved
+// so we can call the runtime methods
+func (a *App) startup(ctx context.Context) {
+	a.ctx = ctx
+	a.InitBackend(ctx)
+}
+
+// Greet returns a greeting for the given name
+func (a *App) Greet(name string) string {
+	return fmt.Sprintf("Hello %s, It's show time!", name)
+}
+
+// Initialise backend SysInfo on startup and expose its methods
+func (a *App) InitBackend(ctx context.Context) {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	a.ctx = ctx
+	a.sys = backend.NewSysInfo(a.ctx)
+}
+
+// GetMetrics proxies to backend.SysInfo.GetMetrics
+func (a *App) GetMetrics() (*backend.Metrics, error) {
+	if a.sys == nil {
+		a.InitBackend(a.ctx)
+	}
+	return a.sys.GetMetrics()
+}
+
+// GetProcessDetail returns all available details for the given PID.
+func (a *App) GetProcessDetail(pid int32) (*backend.ProcessDetail, error) {
+	return backend.FetchProcessDetail(pid)
+}
+
+// KillProcess terminates a process by PID. Set force=true for SIGKILL.
+func (a *App) KillProcess(pid int32, force bool) error {
+	return backend.KillProcess(pid, force)
+}