onboard(minimax): flatten auth to 4 direct choices, unify CN/Global under single provider (#44284)

Replace the multi-step MiniMax onboarding wizard with 4 flat options:
- MiniMax Global — OAuth (minimax.io)
- MiniMax Global — API Key (minimax.io)
- MiniMax CN — OAuth (minimaxi.com)
- MiniMax CN — API Key (minimaxi.com)

Storage changes:
- Unify CN and Global under provider "minimax" (baseUrl distinguishes region)
- Profiles: minimax:global / minimax:cn (both regions can coexist)
- Model ref: minimax/MiniMax-M2.5 (no more minimax-cn/ prefix)
- Remove LM Studio local mode and Lightning/Highspeed choice

Backward compatibility:
- Keep minimax-cn in provider-env-vars for existing configs
- Accept minimax-cn as legacy tokenProvider in CI pipelines
- Error with migration hint for removed auth choices in non-interactive mode
- Warn when dual-profile overwrites shared provider baseUrl

Made-with: Cursor

src/agents/models-config.merge.test.ts

@@ -9,20 +9,6 @@ import type { ProviderConfig } from "./models-config.providers.js";
 
 describe("models-config merge helpers", () => {
   const preservedApiKey = "AGENT_KEY"; // pragma: allowlist secret
-  const kimiModel: ProviderConfig["models"][number] = {
-    id: "k2p5",
-    name: "Kimi for Coding",
-    input: ["text", "image"],
-    reasoning: true,
-    cost: {
-      input: 0,
-      output: 0,
-      cacheRead: 0,
-      cacheWrite: 0,
-    },
-    contextWindow: 128_000,
-    maxTokens: 8_000,
-  };
 
   it("refreshes implicit model metadata while preserving explicit reasoning overrides", () => {
     const merged = mergeProviderModels(
@@ -83,17 +69,31 @@ describe("models-config merge helpers", () => {
   it("preserves implicit provider headers when explicit config adds extra headers", () => {
     const merged = mergeProviderModels(
       {
+        baseUrl: "https://api.example.com",
         api: "anthropic-messages",
-        baseUrl: "https://api.anthropic.com",
         headers: { "User-Agent": "claude-code/0.1.0" },
-        models: [kimiModel],
-      } as ProviderConfig,
+        models: [
+          {
+            id: "k2p5",
+            name: "Kimi for Coding",
+            input: ["text", "image"],
+            reasoning: true,
+          },
+        ],
+      } as unknown as ProviderConfig,
       {
+        baseUrl: "https://api.example.com",
         api: "anthropic-messages",
-        baseUrl: "https://api.anthropic.com",
         headers: { "X-Kimi-Tenant": "tenant-a" },
-        models: [kimiModel],
-      } as ProviderConfig,
+        models: [
+          {
+            id: "k2p5",
+            name: "Kimi for Coding",
+            input: ["text", "image"],
+            reasoning: true,
+          },
+        ],
+      } as unknown as ProviderConfig,
     );
 
     expect(merged.headers).toEqual({

src/agents/models-config.providers.static.ts

@@ -187,7 +187,7 @@ const MODELSTUDIO_MODEL_CATALOG: ReadonlyArray<ProviderModelConfig> = [
   {
     id: "MiniMax-M2.5",
     name: "MiniMax-M2.5",
-    reasoning: false,
+    reasoning: true,
     input: ["text"],
     cost: MODELSTUDIO_DEFAULT_COST,
     contextWindow: 1_000_000,