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/opencode.models.ts

@@ -691,6 +691,24 @@ export const OPENCODE_MODELS = {
 		contextWindow: 256000,
 		maxTokens: 256000,
 	} satisfies Model<"openai-completions">,
+	"hy3-free": {
+		id: "hy3-free",
+		name: "Hy3 Free",
+		api: "openai-completions",
+		provider: "opencode",
+		baseUrl: "https://opencode.ai/zen/v1",
+		compat: {"supportsStore":false,"supportsDeveloperRole":false,"maxTokensField":"max_tokens"},
+		reasoning: true,
+		input: ["text"],
+		cost: {
+			input: 0,
+			output: 0,
+			cacheRead: 0,
+			cacheWrite: 0,
+		},
+		contextWindow: 256000,
+		maxTokens: 64000,
+	} satisfies Model<"openai-completions">,
 	"kimi-k2.5": {
 		id: "kimi-k2.5",
 		name: "Kimi K2.5",