feat(widget): Widget 配置、loader 与右下角悬浮入口

生成可嵌入站点的 loader 与悬浮按钮，支持展开收起和移动端；附独立宿主测试页。

frontend/public/assets/avatars/custom-agent.svg

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frontend/public/assets/avatars/general-agent.svg

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frontend/public/assets/avatars/sales-agent.svg

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frontend/public/assets/avatars/support-agent.svg

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frontend/public/assets/favicon.svg

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frontend/public/assets/images/logo.svg

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+<svg width="32" height="32" viewBox="0 0 120 120" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <!-- Chat bubble background -->
+  <path 
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+  
+  <!-- Letter C -->
+  <path 
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+  <!-- Dots -->
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+</svg>

frontend/public/assets/images/logo_dark.svg

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+<svg width="1200" height="1200" viewBox="0 0 120 120" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <!-- Chat bubble background with subtle outline -->
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+  <!-- Letter C -->
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