feat(cloud): Add custom cloud API URL configuration support (#181)

* feat(cloud): Add custom cloud API URL configuration support

- Implement RPC methods to set, get, and reset cloud URL
- Update cloud registration to remove hardcoded cloud API URL
- Modify UI to allow configuring custom cloud API URL in developer settings
- Remove environment-specific cloud configuration files
- Simplify cloud URL configuration in UI config

* fix(ui): Update cloud app URL to production environment in device mode

* refactor(ui): Remove SIGNAL_API env & Rename to DEVICE_API to make clear distinction between  CLOUD_API and DEVICE_API.

* feat(ui): Only show Cloud API URL Change on device mode

* fix(cloud): Don't override the CloudURL on deregistration from the cloud.

ui/package.json

@@ -8,11 +8,11 @@
   },
   "scripts": {
     "dev": "./dev_device.sh",
-    "dev:cloud": "vite dev --mode=development",
+    "dev:cloud": "vite dev --mode=cloud-development",
     "build": "npm run build:prod",
     "build:device": "tsc && vite build --mode=device --emptyOutDir",
-    "build:staging": "tsc && vite build --mode=staging",
-    "build:prod": "tsc && vite build --mode=production",
+    "build:staging": "tsc && vite build --mode=cloud-staging",
+    "build:prod": "tsc && vite build --mode=cloud-production",
     "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
     "preview": "vite preview"
   },