refactor: rename configuration variables for clarity

Standardize naming across CLI and server components:
- CLI: serverUrl → apiUrl, HAPI_SERVER_URL → HAPI_API_URL
- Server: webapp* → listen*, miniAppUrl → publicUrl, WEBAPP_* → HAPI_LISTEN_*, WEBAPP_URL → HAPI_PUBLIC_URL
- Rename serverUrlInit.ts → apiUrlInit.ts with updated logic for backward compatibility
- Update all imports, function calls, and documentation accordingly

cli/src/api/apiMachine.ts

@@ -215,7 +215,7 @@ export class ApiMachineClient {
     }
 
     connect(): void {
-        this.socket = io(`${configuration.serverUrl}/cli`, {
+        this.socket = io(`${configuration.apiUrl}/cli`, {
             transports: ['websocket'],
             auth: {
                 token: this.token,