feat(cloud): Add support for custom cloud app URL configuration (#207)

* feat(cloud): Add support for custom cloud app URL configuration

- Extend CloudState and Config to include CloudAppURL
- Update RPC methods to handle both API and app URLs
- Modify cloud adoption and settings routes to support custom app URLs
- Remove hardcoded cloud app URL environment file
- Simplify cloud URL configuration in UI

* fix(cloud): Improve cloud URL configuration and adoption flow

- Update error handling in cloud URL configuration RPC method
- Modify cloud adoption route to support dynamic cloud URLs
- Remove hardcoded default cloud URLs in device access settings
- Refactor cloud adoption click handler to be more flexible

* refactor(cloud): Simplify cloud URL configuration RPC method

- Update rpcSetCloudUrl to return only an error
- Remove unnecessary boolean return value
- Improve error handling consistency

* refactor(ui): Simplify cloud provider configuration and URL handling

config.go

@@ -22,6 +22,7 @@ type UsbConfig struct {
 
 type Config struct {
 	CloudURL             string            `json:"cloud_url"`
+	CloudAppURL          string            `json:"cloud_app_url"`
 	CloudToken           string            `json:"cloud_token"`
 	GoogleIdentity       string            `json:"google_identity"`
 	JigglerEnabled       bool              `json:"jiggler_enabled"`
@@ -43,6 +44,7 @@ const configPath = "/userdata/kvm_config.json"
 
 var defaultConfig = &Config{
 	CloudURL:             "https://api.jetkvm.com",
+	CloudAppURL:          "https://app.jetkvm.com",
 	AutoUpdateEnabled:    true, // Set a default value
 	ActiveExtension:      "",
 	DisplayMaxBrightness: 64,