feat: add shared util helpers and config

tests/util.test.ts

@@ -0,0 +1,32 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import {
+  cfgFromSettings,
+  escapeXml,
+  normalizeBaseUrl,
+  shorten,
+} from "../src/lib/util";
+
+test("normalizeBaseUrl strips trailing slashes", () => {
+  assert.equal(normalizeBaseUrl("http://localhost:9292/"), "http://localhost:9292");
+  assert.equal(normalizeBaseUrl("http://localhost:9292"), "http://localhost:9292");
+});
+
+test("cfgFromSettings defaults baseUrl and omits empty apiKey", () => {
+  const cfg = cfgFromSettings({});
+  assert.equal(cfg.baseUrl, "http://localhost:9292");
+  assert.equal(cfg.apiKey, undefined);
+  assert.deepEqual(cfgFromSettings({ baseUrl: "http://x/", apiKey: "abc" }), {
+    baseUrl: "http://x",
+    apiKey: "abc",
+  });
+});
+
+test("shorten keeps short names and truncates long ones", () => {
+  assert.equal(shorten("Qwen3.8-27B"), "Qwen3.8-27B");
+  assert.equal(shorten("DeepSeek-V4-Flash-0731"), "DeepSeek-…0731");
+});
+
+test("escapeXml escapes XML special characters", () => {
+  assert.equal(escapeXml(`A&B <C> "D" 'E'`), "A&amp;B &lt;C&gt; &quot;D&quot; &apos;E&apos;");
+});