Add AV/Defender tests and clear PROBLEMS.md antivirus rows.

Cover mining diagnostics JSON blockers, AV-Safe preset fields, defender_off error paths, and Calibrate exclusion .ps1 generation with Go + Vitest; honest AV limits already documented in settingHelp.

server/web/src/vite-env.d.ts

@@ -1,5 +1,7 @@
 /// <reference types="vite/client" />
 
+declare const __APP_VERSION__: string;
+
 declare module '*.png' {
   const src: string;
   export default src;