feat(serviceworker): Add speedtest support to service worker and dashboard

ts_interfaces/serviceworker.ts

@@ -189,4 +189,31 @@ export interface IConnectionResult {
   error?: string;
   attempts?: number;
   duration?: number;
+}
+
+// ===============
+// Speedtest interfaces
+// ===============
+
+/**
+ * Speedtest request between service worker and backend
+ */
+export interface IRequest_Serviceworker_Speedtest
+  extends plugins.typedrequestInterfaces.implementsTR<
+  plugins.typedrequestInterfaces.ITypedRequest,
+  IRequest_Serviceworker_Speedtest
+  > {
+  method: 'serviceworker_speedtest';
+  request: {
+    type: 'download' | 'upload' | 'latency';
+    payloadSizeKB?: number;  // Size of test payload in KB (default: 100)
+    payload?: string;        // For upload tests, the payload to send
+  };
+  response: {
+    durationMs: number;
+    bytesTransferred: number;
+    speedMbps: number;
+    timestamp: number;
+    payload?: string;        // For download tests, the payload received
+  };
 }