feat: replace animated backgrounds with Aceternity UI system

- Add 16 animated background components (aurora, sparkles, vortex, shooting-stars,
  beams, beams-collision, gradient-animation, wavy, lines, boxes, meteors, grid,
  dots, spotlight, noise, ripple, gemini-effect)
- Add full admin BackgroundEditor with live preview, type gallery, per-type settings
- Add BackgroundRenderer with lazy loading, localStorage cache, mobile reduction
- Add input sanitization (sanitizeColor, clampNumber) across all components
- Add translations for en, ru, zh, fa locales
- Remove old Aurora (WebGL/OGL) and AnimatedBackground (CSS wave-blob)
- Remove ogl dependency, add simplex-noise

package.json

@@ -44,12 +44,12 @@
     "i18next": "^25.8.4",
     "i18next-browser-languagedetector": "^8.2.0",
     "jsencrypt": "^3.5.4",
-    "ogl": "^1.0.11",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "react-i18next": "^16.5.4",
     "react-router": "^7.13.0",
     "react-twemoji": "^0.7.2",
+    "simplex-noise": "^4.0.3",
     "tailwind-merge": "^3.4.0",
     "zustand": "^5.0.11"
   },