feat(benchmark): the built-in benchmark, redesigned into the console

The old standalone benchmark.html (Russian-only, Tailwind+Chart.js from CDNs,
never shipped in the crate) becomes a proper sidebar view. Same scoring ideas,
reimplemented: keyword checks with |-synonyms, think-tag stripping, tail-loop
detection, pass/partial/fail — plus what the old page never had: runs go
through the LIVE pipeline (pinned per model, streamed), so every test also
measures tok/s and time-to-first-token with the gateway's real token counts.

A built-in suite of 12 language-neutral probes (math, logic, code, QA,
instruction-following, extraction, translation, JSON formatting); the ⚡ quick
mode runs the 6 short ones — about a minute on a local model. Results: score
bars per model sorted best-first, a per-test grid (click a cell for the full
answer), previous runs and custom tests kept in the browser.

22 new strings in all 7 languages.

web/js/i18n/zh.js

@@ -563,4 +563,28 @@ export default {
   "routing.tasks.builtin": "路由器不可达 — 使用内置标签集",
   "routing.tasks.addCustom": "添加任务",
   "routing.tasks.addPlaceholder": "自定义标签……",
+
+  // benchmark view
+  "nav.benchmark": "基准测试",
+  "bm.title": "基准测试",
+  "bm.subtitle": "通过实时管线做质量与速度探测：按关键词核对答案、检测循环输出，并按模型测量 tok/s 与首个 token 时间。",
+  "bm.models": "要测试的模型",
+  "bm.quickMode": "快速测试",
+  "bm.quickHint": "答案简短的快速子集 — 每个本地模型约一分钟。",
+  "bm.suiteInfo": "内置套件：{q} 个快速 / {f} 个完整测试，另加你自己的。",
+  "bm.run": "运行",
+  "bm.pickModel": "请至少选择一个模型。",
+  "bm.testOf": "第 {i}/{n} 个测试",
+  "bm.results": "结果",
+  "bm.quick": "快速",
+  "bm.test": "测试",
+  "bm.cellHint": "点击单元格查看模型的完整回答。",
+  "bm.history": "历史运行（保存在本浏览器）",
+  "bm.custom": "自定义测试",
+  "bm.customHint": "提示词 + 逗号分隔的关键词，回答必须包含它们（| 表示同义词）。保存在本浏览器。",
+  "bm.promptPh": "提示词……",
+  "bm.checkPh": "关键词，逗号分隔",
+  "bm.addTest": "添加测试",
+  "bm.emptyAnswer": "回答为空",
+  "bm.loopDetected": "检测到循环",
 };