feat(preset): add icon configuration to provider presets

- Add icon/iconColor fields to CodexProviderPreset and GeminiProviderPreset interfaces
- Configure icons for Claude presets (DeepSeek, Zhipu, Qwen, Kimi, MiniMax, DouBao, etc.)
- Configure icons for Codex presets (OpenAI, Azure, PackyCode)
- Configure icons for Gemini presets (Google, PackyCode)
- Fix handlePresetChange to pass icon fields when resetting form

This ensures preset icons are displayed in the icon picker when selecting a provider preset.

src/components/providers/forms/ProviderForm.tsx

@@ -698,6 +698,8 @@ export function ProviderForm({
         name: preset.name,
         websiteUrl: preset.websiteUrl ?? "",
         settingsConfig: JSON.stringify({ auth, config }, null, 2),
+        icon: preset.icon ?? "",
+        iconColor: preset.iconColor ?? "",
       });
       return;
     }
@@ -715,6 +717,8 @@ export function ProviderForm({
         name: preset.name,
         websiteUrl: preset.websiteUrl ?? "",
         settingsConfig: JSON.stringify(preset.settingsConfig, null, 2),
+        icon: preset.icon ?? "",
+        iconColor: preset.iconColor ?? "",
       });
       return;
     }
@@ -729,6 +733,8 @@ export function ProviderForm({
       name: preset.name,
       websiteUrl: preset.websiteUrl ?? "",
       settingsConfig: JSON.stringify(config, null, 2),
+      icon: preset.icon ?? "",
+      iconColor: preset.iconColor ?? "",
     });
   };