fix: honest costs in streams, oracle-sized timeouts, history & log cleanup

Cost showed $0 for every streamed request: the X-Cortiq-Cost-USD header is
written before generation, when the cost cannot be known. The gateway now
ships the final number in a closing SSE event (`cortiq_cost_usd`, alongside
the token estimate when the provider sent no usage), and the console prefers
it over the header. Money renders with 4 decimals, the last two in a smaller
font — $0.0006 stays readable instead of collapsing to $0.

Timeouts, both ends: the router default was 800 ms, silently degrading every
prompt the hosted router escalates to its oracle (~10 s) — now 15 s. Provider
clients had NO timeout at all (a dead OpenRouter host hung requests forever) —
now a 10 s connect timeout, with no overall cap so long generations and
streams are never cut.

Benchmark history: per-run × and a Clear-all button. Logs view: a clear
button backed by DELETE /admin/api/logs.

web/js/views/benchmark.js

@@ -7,7 +7,7 @@
 // A redesign of the old standalone benchmark.html: same scoring ideas
 // (keyword checks with | synonyms, think-tag stripping, anti-loop detection,
 // pass/partial/fail), now embedded, localized and CDN-free.
-import { h, mount, toast, ms, money } from "../ui.js";
+import { h, mount, toast, ms, money, moneyEl } from "../ui.js";
 import { t } from "../i18n.js";
 import { api, testStream } from "../api.js";
 
@@ -60,6 +60,9 @@ function pushHistory(run) {
   l.unshift(run);
   localStorage.setItem(LS_HISTORY, JSON.stringify(l.slice(0, 12)));
 }
+function saveHistory(l) {
+  localStorage.setItem(LS_HISTORY, JSON.stringify(l));
+}
 
 // ── evaluation (ported from the old benchmark, trimmed) ─────────────────────
 function stripThink(text) {
@@ -261,11 +264,11 @@ export async function renderBenchmark() {
           h("div", { class: "kpi" }, h("div", { class: "big" }, judged.length ? `${okCount}/${judged.length}` : "—"), h("div", { class: "lbl" }, t("bm.classAcc"))),
           h("div", { class: "kpi" }, h("div", { class: "big" }, st.ttft != null ? ms(Math.round(st.ttft)) : "—"), h("div", { class: "lbl" }, t("pg.ttft"))),
           h("div", { class: "kpi" }, h("div", { class: "big" }, st.tokS != null ? st.tokS.toFixed(1) : "—"), h("div", { class: "lbl" }, "tok/s")),
-          h("div", { class: "kpi" }, h("div", { class: "big" }, money(st.cost)), h("div", { class: "lbl" }, t("bm.spent")))),
+          h("div", { class: "kpi" }, h("div", { class: "big" }, moneyEl(st.cost)), h("div", { class: "lbl" }, t("bm.spent")))),
         h("div", { class: "flex wrap", style: "gap:6px; margin-top:4px" },
           h("span", { class: "muted small" }, t("bm.modelDist") + ":"),
           ...Object.entries(dist).map(([m, d]) =>
-            h("span", { class: "badge" }, `${m} × ${d.n}` + (d.cost > 0 ? ` · ${money(d.cost)}` : "")))));
+            h("span", { class: "badge" }, `${m} × ${d.n}`, d.cost > 0 ? " · " : "", d.cost > 0 ? moneyEl(d.cost) : ""))));
     } else {
       const sorted = models.slice().sort((a, b) => stats(run.models[b]).score - stats(run.models[a]).score);
       summary = h("div", {},
@@ -278,7 +281,7 @@ export async function renderBenchmark() {
               h("span", { class: "badge " + (pct >= 80 ? "ok" : pct >= 50 ? "" : "bad") }, pct + "%"),
               st.tokS != null ? h("span", { class: "muted small", style: "margin-left:8px" }, st.tokS.toFixed(1) + " tok/s") : null,
               st.ttft != null ? h("span", { class: "muted small", style: "margin-left:8px" }, "TTFT " + ms(Math.round(st.ttft))) : null,
-              st.cost > 0 ? h("span", { class: "muted small", style: "margin-left:8px" }, t("bm.spent") + " " + money(st.cost)) : null),
+              st.cost > 0 ? h("span", { class: "muted small", style: "margin-left:8px" }, t("bm.spent") + " ", moneyEl(st.cost)) : null),
             h("div", { class: "sysbar" }, h("i", { class: pct < 50 ? "bad" : "", style: `width:${pct}%` })));
         }));
     }
@@ -316,7 +319,7 @@ export async function renderBenchmark() {
           h("td", {}, r.tier ? h("span", { class: "badge tier-" + r.tier }, r.tier) : "—"),
           h("td", {},
             h("span", { class: "mono small" }, r.chosen || "—"),
-            r.cost > 0 ? h("div", { class: "muted small" }, money(r.cost)) : null,
+            r.cost > 0 ? h("div", { class: "muted small" }, moneyEl(r.cost)) : null,
             r.source && r.source.includes("task-rule") ? h("div", { class: "badge", style: "margin-top:2px" }, "task-rule") : null),
           answerCell(r, r.chosen || "cortiq-auto")));
     } else {
@@ -350,9 +353,16 @@ export async function renderBenchmark() {
       mount(historyHost);
       return;
     }
+    const clearAll = h("button", { class: "btn ghost sm danger" }, "🗑 " + t("bm.clearHistory"));
+    clearAll.addEventListener("click", () => {
+      saveHistory([]);
+      renderHistory();
+    });
     mount(historyHost, h("div", { class: "card" },
-      h("div", { class: "card-title" }, t("bm.history")),
-      ...l.map((run) => {
+      h("div", { class: "card-head" },
+        h("h3", {}, t("bm.history")),
+        h("div", { class: "right" }, clearAll)),
+      ...l.map((run, idx) => {
         const models = Object.keys(run.models);
         const scoreOf = (m) => {
           const rs = run.models[m].results || [];
@@ -364,7 +374,13 @@ export async function renderBenchmark() {
           h("span", { class: "muted small" }, new Date(run.ts).toLocaleString()),
           h("span", { class: "grow mono small" }, run.mode === "routing" ? t("bm.mode.routing") : models.join(", ")),
           run.quick ? h("span", { class: "badge" }, t("bm.quick")) : null,
-          best ? h("b", {}, Math.round(scoreOf(best) * 100) + "%") : null);
+          best ? h("b", {}, Math.round(scoreOf(best) * 100) + "%") : null,
+          h("button", { class: "btn sm ghost danger", title: t("common.delete"), onClick: (e) => {
+            e.stopPropagation();
+            l.splice(idx, 1);
+            saveHistory(l);
+            renderHistory();
+          } }, "×"));
         row.addEventListener("click", () => renderResults(run));
         return row;
       })));