feat: implement ADB wrapper and device management backend

Adds full ADB client, device manager, static DeviceInfo fetcher, and
live DeviceLiveStats poller. Exposes ListDevices, ConnectDevice,
DisconnectDevice, GetDeviceInfo, GetDeviceLiveStats as Wails-bound
methods with a 1s devices:changed event loop. Bundles ADB binary
infrastructure via //go:embed all:bin with runtime fallback chain.

desktop/go.mod

@@ -1,8 +1,13 @@
 module git.achmad.dev/admin/droidscope/desktop
 
-go 1.23.0
+go 1.26.2
 
-require github.com/wailsapp/wails/v2 v2.12.0
+require (
+	git.achmad.dev/admin/droidscope/backend v0.0.0
+	github.com/wailsapp/wails/v2 v2.12.0
+)
+
+replace git.achmad.dev/admin/droidscope/backend => ../backend-go
 
 require (
 	git.sr.ht/~jackmordaunt/go-toast/v2 v2.0.3 // indirect
@@ -34,5 +39,3 @@ require (
 	golang.org/x/sys v0.30.0 // indirect
 	golang.org/x/text v0.22.0 // indirect
 )
-
-// replace github.com/wailsapp/wails/v2 v2.12.0 => /Users/achmad/go/pkg/mod