Endpoint telemetry, PC Detail rework and a checked backup/restore path

deploy/windows/web.config

@@ -101,6 +101,17 @@
     </rewrite>
     SHOPDB-CLIENTIP-END -->
 
+    <security>
+      <requestFiltering>
+        <!-- IIS request filtering caps a request body at 30,000,000 bytes by
+             default and answers 413 before waitress sees it. The agent package
+             upload accepts 128 MB (MAX_CONTENT_LENGTH is 256 MB), and the tray
+             binary alone is ~69 MB, so the IIS cap has to be raised to match or
+             every agent upload fails on Windows while working under Docker. -->
+        <requestLimits maxAllowedContentLength="268435456" />
+      </requestFiltering>
+    </security>
+
   </system.webServer>
 
   <!--