feat(presets): add Amux provider preset for 6 apps

Non-partner aggregator across Claude Code, Claude Desktop, Codex,
OpenCode, OpenClaw, and Hermes. Claude Code uses bare host
api.amux.ai; Codex uses /v1 native Responses; the other three apps
default to gpt-5.5. No Gemini preset. Registers the amux inline icon
(currentColor) in the icon index and metadata.

src/config/openclawProviderPresets.ts

@@ -474,6 +474,40 @@ export const openclawProviderPresets: OpenClawProviderPreset[] = [
       },
     },
   },
+  {
+    name: "Amux",
+    websiteUrl: "https://amux.ai",
+    apiKeyUrl: "https://amux.ai",
+    settingsConfig: {
+      baseUrl: "https://api.amux.ai/v1",
+      apiKey: "",
+      api: "openai-completions",
+      models: [
+        {
+          id: "gpt-5.5",
+          name: "GPT-5.5",
+          contextWindow: 400000,
+        },
+      ],
+    },
+    category: "aggregator",
+    icon: "amux",
+    templateValues: {
+      apiKey: {
+        label: "API Key",
+        placeholder: "",
+        editorValue: "",
+      },
+    },
+    suggestedDefaults: {
+      model: {
+        primary: "amux/gpt-5.5",
+      },
+      modelCatalog: {
+        "amux/gpt-5.5": { alias: "GPT-5.5" },
+      },
+    },
+  },
   {
     name: "Unity2.ai",
     websiteUrl: "https://unity2.ai",