refactor(plugins): move auth and model policy to providers

extensions/opencode/index.ts

@@ -1,6 +1,15 @@
 import { emptyPluginConfigSchema, type OpenClawPluginApi } from "openclaw/plugin-sdk/core";
 
 const PROVIDER_ID = "opencode";
+const MINIMAX_PREFIX = "minimax-m2.5";
+
+function isModernOpencodeModel(modelId: string): boolean {
+  const lower = modelId.trim().toLowerCase();
+  if (lower.endsWith("-free") || lower === "alpha-glm-4.7") {
+    return false;
+  }
+  return !lower.startsWith(MINIMAX_PREFIX);
+}
 
 const opencodePlugin = {
   id: PROVIDER_ID,
@@ -19,6 +28,7 @@ const opencodePlugin = {
         geminiThoughtSignatureSanitization: true,
         geminiThoughtSignatureModelHints: ["gemini"],
       },
+      isModernModelRef: ({ modelId }) => isModernOpencodeModel(modelId),
     });
   },
 };