feat(agent): add index bootstrap and answer feedback

pv-agent/web/app.js

@@ -137,6 +137,67 @@ function followUpPanel(question) {
   return box;
 }
 
+function ratingPanel(answerRequestId) {
+  const panel = node("div", "rating-panel");
+  panel.append(node("strong", "", "War diese Antwort hilfreich?"));
+  const actions = node("div", "rating-actions");
+  const up = node("button", "secondary rating-choice", "👍 Ja");
+  const down = node("button", "secondary rating-choice", "👎 Nein");
+  up.type = "button";
+  down.type = "button";
+  actions.append(up, down);
+  panel.append(actions);
+
+  const form = node("div", "rating-form");
+  form.hidden = true;
+  const feedback = node("textarea", "rating-feedback");
+  feedback.rows = 2;
+  feedback.maxLength = 1000;
+  feedback.placeholder = "Optional: Was war hilfreich oder was hat gefehlt?";
+  const send = node("button", "primary", "Bewertung senden");
+  send.type = "button";
+  const status = node("span", "rating-status");
+  form.append(feedback, send, status);
+  panel.append(form);
+
+  let selection = null;
+  const select = (value, selected, other) => {
+    selection = value;
+    selected.classList.add("is-selected");
+    other.classList.remove("is-selected");
+    form.hidden = false;
+    feedback.focus();
+  };
+  up.addEventListener("click", () => select("up", up, down));
+  down.addEventListener("click", () => select("down", down, up));
+  send.addEventListener("click", async () => {
+    if (!selection) return;
+    send.disabled = true;
+    status.textContent = "Wird gespeichert …";
+    try {
+      const response = await fetch("/v1/ratings", {
+        method: "POST",
+        headers: apiHeaders(),
+        body: JSON.stringify({
+          request_id: answerRequestId,
+          rating: selection,
+          feedback: feedback.value.trim() || null,
+        }),
+      });
+      if (!response.ok) throw new Error(await errorDetail(response));
+      status.textContent = "Danke, Bewertung gespeichert.";
+      up.disabled = true;
+      down.disabled = true;
+      feedback.disabled = true;
+      send.hidden = true;
+    } catch (error) {
+      status.textContent = error.message || "Bewertung konnte nicht gespeichert werden.";
+      send.disabled = false;
+    }
+  });
+  return panel;
+}
+
 function technicalPanel(data) {
   const details = node("details", "technical-panel");
   details.append(node("summary", "", "Technische Details"));
@@ -182,6 +243,9 @@ function addAgentMessage(data) {
   if (Array.isArray(data.sources) && data.sources.length) {
     body.append(sourcePanel(data.sources));
   }
+  if (data.ratings_enabled && data.request_id) {
+    body.append(ratingPanel(data.request_id));
+  }
 
   const seconds = typeof data.latency_ms === "number" ? `${(data.latency_ms / 1000).toFixed(1)} s` : "–";
   body.append(node("div", "answer-meta", `${data.model || "Modell"} · ${seconds} · ${data.citations?.length || 0} Zitate`));