refactor: unify configure auth choice

src/commands/onboard-auth.test.ts

@@ -177,7 +177,7 @@ describe("applyMinimaxApiConfig", () => {
     ).toMatchObject({ alias: "Minimax", params: { custom: "value" } });
   });
 
-  it("replaces existing minimax provider entirely", () => {
+  it("merges existing minimax provider models", () => {
     const cfg = applyMinimaxApiConfig({
       models: {
         providers: {
@@ -204,7 +204,11 @@ describe("applyMinimaxApiConfig", () => {
       "https://api.minimax.io/anthropic",
     );
     expect(cfg.models?.providers?.minimax?.api).toBe("anthropic-messages");
-    expect(cfg.models?.providers?.minimax?.models[0]?.id).toBe("MiniMax-M2.1");
+    expect(cfg.models?.providers?.minimax?.apiKey).toBe("old-key");
+    expect(cfg.models?.providers?.minimax?.models.map((m) => m.id)).toEqual([
+      "old-model",
+      "MiniMax-M2.1",
+    ]);
   });
 
   it("preserves other providers when adding minimax", () => {

src/commands/onboard-auth.ts

@@ -334,11 +334,27 @@ export function applyMinimaxApiProviderConfig(
   modelId: string = "MiniMax-M2.1",
 ): ClawdbotConfig {
   const providers = { ...cfg.models?.providers };
+  const existingProvider = providers.minimax;
+  const existingModels = Array.isArray(existingProvider?.models)
+    ? existingProvider.models
+    : [];
+  const apiModel = buildMinimaxApiModelDefinition(modelId);
+  const hasApiModel = existingModels.some((model) => model.id === modelId);
+  const mergedModels = hasApiModel
+    ? existingModels
+    : [...existingModels, apiModel];
+  const { apiKey: existingApiKey, ...existingProviderRest } =
+    (existingProvider ?? {}) as Record<string, unknown> as { apiKey?: string };
+  const resolvedApiKey =
+    typeof existingApiKey === "string" ? existingApiKey : undefined;
+  const normalizedApiKey =
+    resolvedApiKey?.trim() === "minimax" ? "" : resolvedApiKey;
   providers.minimax = {
+    ...existingProviderRest,
     baseUrl: MINIMAX_API_BASE_URL,
-    // apiKey omitted: resolved via MINIMAX_API_KEY env var or auth profile by default.
     api: "anthropic-messages",
-    models: [buildMinimaxApiModelDefinition(modelId)],
+    ...(normalizedApiKey?.trim() ? { apiKey: normalizedApiKey } : {}),
+    models: mergedModels.length > 0 ? mergedModels : [apiModel],
   };
 
   const models = { ...cfg.agents?.defaults?.models };