Feat: add env-driven LLM configuration and smoke test

scripts/llm-smoke.ts

@@ -0,0 +1,28 @@
+import "dotenv/config";
+import { invokeLLM } from "../server/_core/llm";
+
+async function main() {
+  const prompt = process.argv.slice(2).join(" ").trim() || "你好，做个自我介绍";
+  const result = await invokeLLM({
+    messages: [{ role: "user", content: prompt }],
+  });
+
+  const firstChoice = result.choices[0];
+  const content = firstChoice?.message?.content;
+
+  console.log(`model=${result.model}`);
+  console.log(`finish_reason=${firstChoice?.finish_reason ?? "unknown"}`);
+
+  if (typeof content === "string") {
+    console.log(content);
+    return;
+  }
+
+  console.log(JSON.stringify(content, null, 2));
+}
+
+main().catch(error => {
+  console.error("[LLM smoke test] failed");
+  console.error(error);
+  process.exit(1);
+});