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/total-tokens.test.ts

@@ -562,6 +562,56 @@ describe("totalTokens field", () => {
 		);
 	});
 
+	// =========================================================================
+	// Qwen Token Plan
+	// =========================================================================
+
+	describe.skipIf(!process.env.QWEN_TOKEN_PLAN_API_KEY)("Qwen Token Plan", () => {
+		it(
+			"qwen3.7-max - should return totalTokens equal to sum of components",
+			{ retry: 3, timeout: 60000 },
+			async () => {
+				const llm = getModel("qwen-token-plan", "qwen3.7-max");
+
+				console.log(`\nQwen Token Plan / ${llm.id}:`);
+				const { first, second } = await testTotalTokensWithCache(llm, {
+					apiKey: process.env.QWEN_TOKEN_PLAN_API_KEY,
+				});
+
+				logUsage("First request", first);
+				logUsage("Second request", second);
+
+				assertTotalTokensEqualsComponents(first);
+				assertTotalTokensEqualsComponents(second);
+			},
+		);
+	});
+
+	// =========================================================================
+	// Qwen Token Plan CN
+	// =========================================================================
+
+	describe.skipIf(!process.env.QWEN_TOKEN_PLAN_CN_API_KEY)("Qwen Token Plan (CN)", () => {
+		it(
+			"qwen3.7-max - should return totalTokens equal to sum of components",
+			{ retry: 3, timeout: 60000 },
+			async () => {
+				const llm = getModel("qwen-token-plan-cn", "qwen3.7-max");
+
+				console.log(`\nQwen Token Plan CN / ${llm.id}:`);
+				const { first, second } = await testTotalTokensWithCache(llm, {
+					apiKey: process.env.QWEN_TOKEN_PLAN_CN_API_KEY,
+				});
+
+				logUsage("First request", first);
+				logUsage("Second request", second);
+
+				assertTotalTokensEqualsComponents(first);
+				assertTotalTokensEqualsComponents(second);
+			},
+		);
+	});
+
 	// =========================================================================
 	// Kimi For Coding
 	// =========================================================================