feat(web_serviceworker): Enable service worker dashboard speedtests via TypedSocket, expose ServiceWorker instance to dashboard, and add server-side speedtest handler

ts/classes.typedserver.ts

@@ -306,6 +306,35 @@ export class TypedServer {
           };
         })
       );
+
+      // Speedtest handler for service worker dashboard
+      this.typedrouter.addTypedHandler<interfaces.serviceworker.IRequest_Serviceworker_Speedtest>(
+        new plugins.typedrequest.TypedHandler('serviceworker_speedtest', async (reqArg) => {
+          const startTime = Date.now();
+          const payloadSizeKB = reqArg.payloadSizeKB || 100;
+          const sizeBytes = payloadSizeKB * 1024;
+          let payload: string | undefined;
+          let bytesTransferred = 0;
+
+          switch (reqArg.type) {
+            case 'download':
+              payload = 'x'.repeat(sizeBytes);
+              bytesTransferred = sizeBytes;
+              break;
+            case 'upload':
+              bytesTransferred = reqArg.payload?.length || 0;
+              break;
+            case 'latency':
+              bytesTransferred = 1;
+              break;
+          }
+
+          const durationMs = Date.now() - startTime;
+          const speedMbps = durationMs > 0 ? (bytesTransferred * 8) / (durationMs * 1000) : 0;
+
+          return { durationMs, bytesTransferred, speedMbps, timestamp: Date.now(), payload };
+        })
+      );
     } catch (error) {
       console.error('Failed to initialize TypedSocket:', error);
     }