feat(ai): add Qwen Token Plan as built-in provider (#6858)

Add Alibaba Cloud Model Studio Token Plan subscription service as two
built-in API-key providers: qwen-token-plan (international, Singapore)
and qwen-token-plan-cn (China, Beijing).

Each provider exposes 15 text-generation models (Qwen, DeepSeek, GLM,
Kimi, MiniMax) via the OpenAI-compatible endpoint with DashScope
enable_thinking support. Model metadata is sourced from models.dev;
qwen3.8-max-preview is hardcoded until models.dev includes it.

Also fixes kimi-coding test references (k2p7 -> kimi-for-coding) after
models.dev catalog update picked up by generate-models.

Closes #6850

packages/ai/test/qwen-token-plan-models.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+import { getModels } from "../src/compat.ts";
+
+const TEXT_MODELS = [
+	"MiniMax-M2.5",
+	"deepseek-v3.2",
+	"deepseek-v4-flash",
+	"deepseek-v4-pro",
+	"glm-5",
+	"glm-5.1",
+	"glm-5.2",
+	"kimi-k2.5",
+	"kimi-k2.6",
+	"kimi-k2.7-code",
+	"qwen3.6-flash",
+	"qwen3.6-plus",
+	"qwen3.7-max",
+	"qwen3.7-plus",
+	"qwen3.8-max-preview",
+];
+
+const IMAGE_MODELS = ["qwen-image-2.0", "qwen-image-2.0-pro", "wan2.7-image", "wan2.7-image-pro"];
+
+describe("Qwen Token Plan models", () => {
+	it.each(["qwen-token-plan", "qwen-token-plan-cn"] as const)("exposes all text models on %s", (provider) => {
+		const modelIds = getModels(provider).map((model) => model.id);
+		for (const expected of TEXT_MODELS) {
+			expect(modelIds, `${provider} should include ${expected}`).toContain(expected);
+		}
+	});
+
+	it.each(["qwen-token-plan", "qwen-token-plan-cn"] as const)("omits image models from %s", (provider) => {
+		const modelIds = getModels(provider).map((model) => model.id);
+		for (const excluded of IMAGE_MODELS) {
+			expect(modelIds, `${provider} should not include ${excluded}`).not.toContain(excluded);
+		}
+	});
+});