feat(providers): add Alibaba Token Plan (token-plan.ap-southeast-1)

Fourth Alibaba key type — Coding Plan (alicode/alicode-intl) and Model Studio
(alims-intl) both reject Token Plan keys. Registry entry only; PROVIDER_MODELS
builds from providers/registry so no executor or translator work is needed.

Singapore-only (eu-central-1 answers IllegalEndpoint) and OpenAI-compatible
transport only (the Anthropic surface is not authorized for this plan).

Closes #2754
Closes #2806

open-sse/providers/registry/alitp-intl.js

@@ -0,0 +1,35 @@
+// Token Plan — credit subscription keys on token-plan.<region>.maas.aliyuncs.com.
+// Fourth Alibaba key type: Coding Plan (alicode/alicode-intl) and Model Studio
+// (alims-intl) both reject these keys, and they reject Model Studio keys back.
+// Singapore is the only region that serves the plan; eu-central-1 answers
+// IllegalEndpoint. The Anthropic surface (/apps/anthropic/v1/messages) is not
+// authorized for this plan, so OpenAI-compatible mode is the only transport.
+export default {
+  id: "alitp-intl",
+  priority: 11,
+  alias: "alitp-intl",
+  display: {
+    name: "Alibaba Token Plan",
+    icon: "cloud",
+    color: "#FF6A00",
+    textIcon: "ATP",
+    website: "https://www.alibabacloud.com/campaign/ai-landing-page-token",
+    notice: {
+      apiKeyUrl: "https://modelstudio.console.alibabacloud.com/?apiKey=1",
+    },
+  },
+  category: "apikey",
+  transport: {
+    baseUrl: "https://token-plan.ap-southeast-1.maas.aliyuncs.com/compatible-mode/v1/chat/completions",
+    headers: {},
+    quirks: { preserveCacheControl: true },
+  },
+  models: [
+    { id: "qwen3.8-max-preview", name: "Qwen3.8 Max Preview" },
+    { id: "qwen3.7-max", name: "Qwen3.7 Max" },
+    { id: "qwen3.7-plus", name: "Qwen3.7 Plus" },
+    { id: "qwen3.6-flash", name: "Qwen3.6 Flash" },
+    { id: "glm-5.2", name: "GLM 5.2" },
+    { id: "deepseek-v4-pro", name: "DeepSeek V4 Pro" },
+  ],
+};

open-sse/providers/registry/index.js

@@ -120,6 +120,7 @@ import p117 from "./selfhosted-stt.js";
 import p118 from "./selfhosted-tts.js";
 import p119 from "./selfhosted-embedding.js";
 import p120 from "./fish-audio.js";
+import p121 from "./alitp-intl.js";
 
 export default [
   p0,
@@ -241,4 +242,5 @@ export default [
   p118,
   p119,
   p120,
+  p121,
 ];