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

src/api/branding.ts

@@ -1,4 +1,8 @@
 import apiClient from './client';
+import type { AnimationConfig } from '@/components/ui/backgrounds/types';
+import { DEFAULT_ANIMATION_CONFIG } from '@/components/ui/backgrounds/types';
+
+export type { AnimationConfig };
 
 export interface BrandingInfo {
   name: string;
@@ -180,6 +184,25 @@ export const brandingApi = {
     return response.data;
   },
 
+  // Get animation config (public, no auth required)
+  getAnimationConfig: async (): Promise<AnimationConfig> => {
+    try {
+      const response = await apiClient.get<AnimationConfig>('/cabinet/branding/animation-config');
+      return response.data;
+    } catch {
+      return DEFAULT_ANIMATION_CONFIG;
+    }
+  },
+
+  // Update animation config (admin only, partial update)
+  updateAnimationConfig: async (config: Partial<AnimationConfig>): Promise<AnimationConfig> => {
+    const response = await apiClient.patch<AnimationConfig>(
+      '/cabinet/branding/animation-config',
+      config,
+    );
+    return response.data;
+  },
+
   // Get fullscreen enabled (public, no auth required)
   getFullscreenEnabled: async (): Promise<FullscreenEnabled> => {
     try {