feat: add @ai-sdk/gateway dependency and integrate VercelLLMAdapter for AI service

Author: hotlong

packages/cli/package.json

@@ -39,6 +39,7 @@
     "topicSeparator": " "
   },
   "dependencies": {
+    "@ai-sdk/gateway": "^3.0.84",
     "@objectstack/core": "workspace:*",
     "@objectstack/driver-memory": "workspace:^",
     "@objectstack/objectql": "workspace:^",

packages/cli/src/commands/serve.ts

@@ -328,8 +328,51 @@ export default class Serve extends Command {
       if (!hasAIPlugin) {
         try {
           const aiPkg = '@objectstack/service-ai';
-          const { AIServicePlugin } = await import(/* webpackIgnore: true */ aiPkg);
-          await kernel.use(new AIServicePlugin());
+          const { AIServicePlugin, VercelLLMAdapter } = await import(/* webpackIgnore: true */ aiPkg);
+
+          // Auto-detect LLM provider from environment variables.
+          // Priority: 1) Vercel AI Gateway  2) Direct provider SDKs  3) MemoryLLMAdapter (echo)
+          let adapter: any = undefined;
+
+          // 1. Vercel AI Gateway — works with any provider via gateway('provider/model')
+          //    Uses OIDC on Vercel, VERCEL_API_KEY locally.
+          const gatewayModel = process.env.AI_GATEWAY_MODEL; // e.g. 'anthropic/claude-sonnet-4.6'
+          if (gatewayModel) {
+            try {
+              const gatewayPkg = '@ai-sdk/gateway';
+              const { gateway } = await import(/* webpackIgnore: true */ gatewayPkg);
+              adapter = new VercelLLMAdapter({ model: gateway(gatewayModel) });
+            } catch {
+              // @ai-sdk/gateway not installed
+            }
+          }
+
+          // 2. Direct provider SDKs
+          if (!adapter) {
+            const providerConfigs: Array<{ envKey: string; pkg: string; factory: string; defaultModel: string }> = [
+              { envKey: 'OPENAI_API_KEY', pkg: '@ai-sdk/openai', factory: 'openai', defaultModel: 'gpt-4o' },
+              { envKey: 'ANTHROPIC_API_KEY', pkg: '@ai-sdk/anthropic', factory: 'anthropic', defaultModel: 'claude-sonnet-4-20250514' },
+              { envKey: 'GOOGLE_GENERATIVE_AI_API_KEY', pkg: '@ai-sdk/google', factory: 'google', defaultModel: 'gemini-2.0-flash' },
+            ];
+
+            for (const { envKey, pkg, factory, defaultModel } of providerConfigs) {
+              if (process.env[envKey]) {
+                try {
+                  const mod = await import(/* webpackIgnore: true */ pkg);
+                  const createModel = mod[factory] ?? mod.default;
+                  if (typeof createModel === 'function') {
+                    const modelId = process.env.AI_MODEL ?? defaultModel;
+                    adapter = new VercelLLMAdapter({ model: createModel(modelId) });
+                    break;
+                  }
+                } catch {
+                  // Provider SDK not installed — skip
+                }
+              }
+            }
+          }
+
+          await kernel.use(new AIServicePlugin(adapter ? { adapter } : undefined));
           trackPlugin('AIService');
         } catch {
           // @objectstack/service-ai not installed — AI features unavailable