feat(icons): add new provider icons and fix SiliconFlow iconColor

- Add rc.svg for RightCode (optimized from 96KB to 581 bytes)
- Add catcoder.svg for KAT-Coder (快手)
- Add mcp.svg for Model Context Protocol
- Add siliconflow.svg for SiliconFlow
- Register all new icons in index.ts
- Add icon config for RightCode in claude/codex presets
- Add icon config for KAT-Coder in claude/opencode presets
- Fix SiliconFlow iconColor from #000000 to #6E29F6

src/config/codexProviderPresets.ts

@@ -192,6 +192,20 @@ requires_openai_auth = true`,
     icon: "aigocode",
     iconColor: "#5B7FFF",
   },
+  {
+    name: "RightCode",
+    websiteUrl: "https://www.right.codes",
+    apiKeyUrl: "https://www.right.codes/register?aff=0bdf9bfa",
+    auth: generateThirdPartyAuth(""),
+    config: generateThirdPartyConfig(
+      "rightcode",
+      "https://right.codes/codex/v1",
+      "gpt-5.2",
+    ),
+    category: "third_party",
+    icon: "rc",
+    iconColor: "#E96B2C",
+  },
   {
     name: "OpenRouter",
     websiteUrl: "https://openrouter.ai",