feat(ui): add Kimi provider logo with dark background

- Add kimi.svg (Moonshot brand logo, white on dark)
- Add kimi to provider-logo.tsx PROVIDER_IMAGES and PROVIDER_CONFIG
- Dark background for kimi logo container (bg-gray-900)

ui/public/assets/providers/kimi.svg

@@ -0,0 +1 @@
+<svg height="1em" style="flex:none;line-height:1" viewBox="0 0 24 24" width="1em" xmlns="http://www.w3.org/2000/svg"><title>Kimi</title><path d="M21.846 0a1.923 1.923 0 110 3.846H20.15a.226.226 0 01-.227-.226V1.923C19.923.861 20.784 0 21.846 0z" fill="#1783FF"></path><path d="M11.065 11.199l7.257-7.2c.137-.136.06-.41-.116-.41H14.3a.164.164 0 00-.117.051l-7.82 7.756c-.122.12-.302.013-.302-.179V3.82c0-.127-.083-.23-.185-.23H3.186c-.103 0-.186.103-.186.23V19.77c0 .128.083.23.186.23h2.69c.103 0 .186-.102.186-.23v-3.25c0-.069.025-.135.069-.178l2.424-2.406a.158.158 0 01.205-.023l6.484 4.772a7.677 7.677 0 003.453 1.283c.108.012.2-.095.2-.23v-3.06c0-.117-.07-.212-.164-.227a5.028 5.028 0 01-2.027-.807l-5.613-4.064c-.117-.078-.132-.279-.028-.381z" fill="#fff"></path></svg>

ui/src/components/cliproxy/provider-logo.tsx

@@ -21,6 +21,7 @@ const PROVIDER_IMAGES: Record<string, string> = {
   kiro: '/assets/providers/kiro.png',
   ghcp: '/assets/providers/copilot.svg',
   claude: '/assets/providers/claude.svg',
+  kimi: '/assets/providers/kimi.svg',
 };
 
 /** Provider color configuration (for fallback only - no background for image logos) */
@@ -33,8 +34,12 @@ const PROVIDER_CONFIG: Record<string, { text: string; letter: string }> = {
   iflow: { text: 'text-indigo-600', letter: 'i' },
   kiro: { text: 'text-teal-600', letter: 'K' },
   ghcp: { text: 'text-green-600', letter: 'C' },
+  kimi: { text: 'text-orange-500', letter: 'K' },
 };
 
+/** Providers whose logos require a dark background */
+const DARK_BG_PROVIDERS = new Set(['kimi']);
+
 /** Size configuration */
 const SIZE_CONFIG = {
   sm: { container: 'w-6 h-6', icon: 'w-4 h-4', text: 'text-xs' },
@@ -55,7 +60,7 @@ export function ProviderLogo({ provider, className, size = 'md' }: ProviderLogoP
     <div
       className={cn(
         'flex items-center justify-center rounded-md',
-        imageSrc && 'bg-white p-1',
+        imageSrc && (DARK_BG_PROVIDERS.has(providerKey) ? 'bg-gray-900 p-1' : 'bg-white p-1'),
         sizeConfig.container,
         className
       )}