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/zh.json

@@ -716,6 +716,96 @@
     }
   },
   "admin": {
+    "backgrounds": {
+      "title": "动画背景",
+      "description": "选择类型并配置动画参数",
+      "selectType": "背景类型",
+      "preview": "预览",
+      "settings": "设置",
+      "save": "保存",
+      "saved": "已保存",
+      "saving": "保存中...",
+      "enabled": "背景已启用",
+      "disabled": "背景已禁用",
+      "reducedOnMobile": "移动端轻量模式",
+      "reducedOnMobileDesc": "减少粒子数量并禁用交互",
+      "globalOpacity": "透明度",
+      "globalBlur": "模糊",
+      "categoryCSS": "CSS",
+      "categoryCanvas": "Canvas",
+      "categorySVG": "SVG",
+      "aurora": "极光",
+      "auroraDesc": "柔和渐变的北极光",
+      "sparkles": "闪烁",
+      "sparklesDesc": "背景中闪烁的粒子",
+      "vortex": "漩涡",
+      "vortexDesc": "旋转的粒子漩涡",
+      "shootingStars": "流星",
+      "shootingStarsDesc": "星空中的流星",
+      "beams": "光束",
+      "beamsDesc": "沿SVG路径的光线",
+      "beamsCollision": "碰撞光束",
+      "beamsCollisionDesc": "爆炸的光束",
+      "gradientAnimation": "渐变动画",
+      "gradientAnimationDesc": "平滑移动的渐变色块",
+      "wavy": "波浪",
+      "wavyDesc": "基于噪声的波浪",
+      "lines": "线条",
+      "linesDesc": "动画SVG波浪",
+      "boxes": "方块",
+      "boxesDesc": "交互式方块网格",
+      "meteors": "流星雨",
+      "meteorsDesc": "飞行的流星",
+      "grid": "网格",
+      "gridDesc": "极简网格图案",
+      "dots": "圆点",
+      "dotsDesc": "圆点图案",
+      "spotlight": "聚光灯",
+      "spotlightDesc": "聚光灯光束",
+      "noise": "噪声",
+      "noiseDesc": "带运动的噪声渐变",
+      "ripple": "涟漪",
+      "rippleDesc": "涟漪波纹效果",
+      "geminiEffect": "Gemini效果",
+      "geminiEffectDesc": "类似Google Gemini的SVG效果",
+      "speed": "速度",
+      "density": "粒子密度",
+      "particles": "粒子数量",
+      "count": "数量",
+      "hue": "色调",
+      "rangeY": "Y范围",
+      "minSize": "最小尺寸",
+      "maxSize": "最大尺寸",
+      "minSpeed": "最小速度",
+      "maxSpeed": "最大速度",
+      "particleColor": "粒子颜色",
+      "starColor": "星星颜色",
+      "trailColor": "尾迹颜色",
+      "bgColor": "背景颜色",
+      "fillColor": "填充颜色",
+      "color1": "颜色1",
+      "color2": "颜色2",
+      "color3": "颜色3",
+      "color4": "颜色4",
+      "color5": "颜色5",
+      "interactive": "交互（鼠标）",
+      "size": "大小",
+      "radialGradient": "径向渐变",
+      "waveWidth": "波浪宽度",
+      "blurAmount": "模糊",
+      "waveOpacity": "波浪透明度",
+      "duration": "持续时间",
+      "intensity": "强度",
+      "rows": "行",
+      "cols": "列",
+      "gridSize": "网格大小",
+      "small": "小",
+      "normal": "普通",
+      "slow": "慢",
+      "fast": "快",
+      "none": "无背景",
+      "noneDesc": "禁用动画背景"
+    },
     "nav": {
       "title": "管理",
       "dashboard": "统计",