chore: bump npm dompurify and vite for audit fixes (0.3.3)

dompurify 3.4.11, vite 6.4.3 — npm audit reports 0 vulnerabilities.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/version.ts

@@ -1,4 +1,4 @@
 /** Fallback до загрузки /health; при релизе держите в sync с backend/app/version.py */
 export const APP_NAME = "Security Alert Center";
-export const APP_VERSION = "0.3.2";
+export const APP_VERSION = "0.3.3";
 export const APP_VERSION_LABEL = `${APP_NAME} v.${APP_VERSION}`;