fix(ai): refresh Xiaomi token plan model catalogs

Use the new provider-specific Xiaomi Token Plan catalogs from models.dev instead of cloning the API-billing Xiaomi catalog into every token-plan region. This removes API-billing-only models such as mimo-v2-omni from xiaomi-token-plan-{cn,ams,sgp}.

packages/ai/src/providers/huggingface.models.ts

@@ -670,6 +670,24 @@ export const HUGGINGFACE_MODELS = {
 		contextWindow: 131072,
 		maxTokens: 32768,
 	} satisfies Model<"openai-completions">,
+	"openai/gpt-oss-20b": {
+		id: "openai/gpt-oss-20b",
+		name: "GPT OSS 20B",
+		api: "openai-completions",
+		provider: "huggingface",
+		baseUrl: "https://router.huggingface.co/v1",
+		compat: {"supportsDeveloperRole":false},
+		reasoning: true,
+		input: ["text"],
+		cost: {
+			input: 0.1,
+			output: 0.5,
+			cacheRead: 0,
+			cacheWrite: 0,
+		},
+		contextWindow: 131072,
+		maxTokens: 32768,
+	} satisfies Model<"openai-completions">,
 	"stepfun-ai/Step-3.5-Flash": {
 		id: "stepfun-ai/Step-3.5-Flash",
 		name: "Step 3.5 Flash",