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/locales/en.json

@@ -828,6 +828,96 @@
     }
   },
   "admin": {
+    "backgrounds": {
+      "title": "Animated Background",
+      "description": "Choose a type and configure animation settings",
+      "selectType": "Background Type",
+      "preview": "Preview",
+      "settings": "Settings",
+      "save": "Save",
+      "saved": "Saved",
+      "saving": "Saving...",
+      "enabled": "Background enabled",
+      "disabled": "Background disabled",
+      "reducedOnMobile": "Reduced mode on mobile",
+      "reducedOnMobileDesc": "Reduces particle count and disables interactivity",
+      "globalOpacity": "Opacity",
+      "globalBlur": "Blur",
+      "categoryCSS": "CSS",
+      "categoryCanvas": "Canvas",
+      "categorySVG": "SVG",
+      "aurora": "Aurora",
+      "auroraDesc": "Northern lights with smooth gradients",
+      "sparkles": "Sparkles",
+      "sparklesDesc": "Twinkling particles on the background",
+      "vortex": "Vortex",
+      "vortexDesc": "Spinning particle vortex",
+      "shootingStars": "Shooting Stars",
+      "shootingStarsDesc": "Falling stars on a starry sky",
+      "beams": "Beams",
+      "beamsDesc": "Light beams along SVG paths",
+      "beamsCollision": "Beams Collision",
+      "beamsCollisionDesc": "Exploding light beams",
+      "gradientAnimation": "Gradient Animation",
+      "gradientAnimationDesc": "Smoothly moving gradient blobs",
+      "wavy": "Wavy",
+      "wavyDesc": "Waves based on simplex noise",
+      "lines": "Lines",
+      "linesDesc": "Animated SVG waves",
+      "boxes": "Boxes",
+      "boxesDesc": "Grid of interactive blocks",
+      "meteors": "Meteors",
+      "meteorsDesc": "Flying meteors",
+      "grid": "Grid",
+      "gridDesc": "Minimalist grid pattern",
+      "dots": "Dots",
+      "dotsDesc": "Dot pattern",
+      "spotlight": "Spotlight",
+      "spotlightDesc": "Spotlight beam",
+      "noise": "Noise",
+      "noiseDesc": "Noise gradients with motion",
+      "ripple": "Ripple",
+      "rippleDesc": "Ripple wave effect",
+      "geminiEffect": "Gemini Effect",
+      "geminiEffectDesc": "SVG effect like Google Gemini",
+      "speed": "Speed",
+      "density": "Particle Density",
+      "particles": "Particle Count",
+      "count": "Count",
+      "hue": "Hue",
+      "rangeY": "Y Range",
+      "minSize": "Min Size",
+      "maxSize": "Max Size",
+      "minSpeed": "Min Speed",
+      "maxSpeed": "Max Speed",
+      "particleColor": "Particle Color",
+      "starColor": "Star Color",
+      "trailColor": "Trail Color",
+      "bgColor": "Background Color",
+      "fillColor": "Fill Color",
+      "color1": "Color 1",
+      "color2": "Color 2",
+      "color3": "Color 3",
+      "color4": "Color 4",
+      "color5": "Color 5",
+      "interactive": "Interactive (mouse)",
+      "size": "Size",
+      "radialGradient": "Radial Gradient",
+      "waveWidth": "Wave Width",
+      "blurAmount": "Blur",
+      "waveOpacity": "Wave Opacity",
+      "duration": "Duration",
+      "intensity": "Intensity",
+      "rows": "Rows",
+      "cols": "Columns",
+      "gridSize": "Grid Size",
+      "small": "Small",
+      "normal": "Normal",
+      "slow": "Slow",
+      "fast": "Fast",
+      "none": "No Background",
+      "noneDesc": "Disable animated background"
+    },
     "groups": {
       "analytics": "Analytics",
       "marketing": "Marketing",