Add OpenAI key save and test controls

public/admin.css

@@ -261,6 +261,19 @@ label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }
   height: 38px;
   padding: 0 10px;
 }
+.ai-actions {
+  grid-column: 1 / -1;
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 8px;
+}
+.ai-actions button {
+  padding: 10px 12px;
+}
+.ai-actions button:last-child {
+  background: #edf3ef;
+  color: var(--ink);
+}
 .list-tools {
   padding: 10px 14px;
   border-bottom: 1px solid var(--line);

public/admin.html

@@ -192,6 +192,10 @@
                     <button id="refreshAiModels" type="button">Obnovit</button>
                   </span>
                 </label>
+                <div class="ai-actions">
+                  <button id="saveAiSettings" type="button">Ulozit AI nastaveni</button>
+                  <button id="testOpenAiKey" type="button">Otestovat klic</button>
+                </div>
               </fieldset>
             </div>
           </section>

public/admin.js

@@ -80,11 +80,13 @@ $("#adminSoundRepeat").addEventListener("change", (event) => {
 $("#adminSoundTest").addEventListener("click", () => {
   playNotifySound({ ignoreMuted: true });
 });
-$("#translationEnabled").addEventListener("change", saveTranslationSettings);
-$("#operatorLanguage").addEventListener("change", saveTranslationSettings);
-$("#translationModel").addEventListener("change", saveTranslationSettings);
-$("#openaiApiKey").addEventListener("change", saveTranslationSettings);
+$("#translationEnabled").addEventListener("change", markAiSettingsDirty);
+$("#operatorLanguage").addEventListener("change", markAiSettingsDirty);
+$("#translationModel").addEventListener("change", markAiSettingsDirty);
+$("#openaiApiKey").addEventListener("input", markAiSettingsDirty);
 $("#refreshAiModels").addEventListener("click", loadAiModels);
+$("#saveAiSettings").addEventListener("click", saveTranslationSettings);
+$("#testOpenAiKey").addEventListener("click", testOpenAiKey);
 document.querySelectorAll("[data-settings-tab]").forEach((button) => {
   button.addEventListener("click", () => {
     const tab = button.dataset.settingsTab;
@@ -403,6 +405,7 @@ function renderSite() {
 
 async function saveTranslationSettings() {
   if (!state.site) return;
+  setOpenAiStatus("Ukladam AI nastaveni...");
   const settings = structuredClone(state.site.settings);
   settings.translations = {
     ...(settings.translations || {}),
@@ -414,9 +417,34 @@ async function saveTranslationSettings() {
   if (apiKey) settings.translations.openaiApiKey = apiKey;
   await saveSite({ settings, isOnline: state.site.isOnline });
   $("#openaiApiKey").value = "";
+  setOpenAiStatus(state.site.settings.translations?.hasOpenaiApiKey
+    ? `Klic ulozeny (${state.site.settings.translations.openaiApiKeyMasked || "sk-..."})`
+    : "Klic neni ulozeny. Bez nej AI preklady nepobezi.");
   await loadAiModels().catch(() => {});
 }
 
+function markAiSettingsDirty() {
+  setOpenAiStatus("AI nastaveni ma neulozene zmeny.");
+}
+
+async function testOpenAiKey() {
+  setOpenAiStatus("Testuji OpenAI klic...");
+  const result = await api("/api/admin/ai/test", { method: "POST" }).catch((error) => error);
+  if (result?.ok) {
+    setOpenAiStatus(`Klic funguje (${result.key || "sk-..."}), dostupnych modelu: ${result.modelCount}.`);
+    await loadAiModels().catch(() => {});
+    return;
+  }
+  const message = result?.error === "missing_openai_api_key"
+    ? "Klic neni ulozeny. Nejdřív ho vloz a klikni na Ulozit AI nastaveni."
+    : `Test selhal (${result?.error || "neznamá chyba"}).`;
+  setOpenAiStatus(message);
+}
+
+function setOpenAiStatus(message) {
+  $("#openaiApiKeyStatus").textContent = message;
+}
+
 async function loadAiModels() {
   const current = $("#translationModel").value || state.site?.settings?.translations?.model || "gpt-5-mini";
   const data = await api("/api/admin/ai/models").catch((error) => error?.models ? error : null);

server.js

@@ -86,6 +86,7 @@ async function adminApi(req, res, url) {
   if (url.pathname === "/api/admin/events" && req.method === "GET") return eventStream(req, res, url, "admin");
   if (url.pathname === "/api/admin/site" && req.method === "PATCH") return updateSite(req, res);
   if (url.pathname === "/api/admin/ai/models" && req.method === "GET") return adminAiModels(res);
+  if (url.pathname === "/api/admin/ai/test" && req.method === "POST") return adminAiTest(res);
   if (url.pathname === "/api/admin/conversations" && req.method === "GET") return adminConversations(res);
   if (url.pathname === "/api/admin/visitors" && req.method === "GET") return adminVisitors(res);
   if (url.pathname.match(/^\/api\/admin\/visitors\/[^/]+$/) && req.method === "PATCH") return updateVisitorProfile(req, res, url);
@@ -471,6 +472,27 @@ async function adminAiModels(res) {
   }
 }
 
+async function adminAiTest(res) {
+  const settings = getTranslationSettings();
+  const apiKey = settings.openaiApiKey;
+  if (!apiKey) return json(res, 400, { ok: false, error: "missing_openai_api_key" });
+  try {
+    const response = await fetch("https://api.openai.com/v1/models", {
+      headers: { "Authorization": `Bearer ${apiKey}` }
+    });
+    if (!response.ok) return json(res, 400, { ok: false, error: `openai_http_${response.status}` });
+    const data = await response.json();
+    return json(res, 200, {
+      ok: true,
+      key: maskApiKey(apiKey),
+      modelCount: Array.isArray(data.data) ? data.data.length : 0
+    });
+  } catch (error) {
+    console.error("openai_test_failed", error.message);
+    return json(res, 502, { ok: false, error: "openai_test_failed" });
+  }
+}
+
 async function updateConversationStatus(req, res, url) {
   const body = await readJson(req);
   const status = ["new", "open", "resolved", "spam"].includes(body.status) ? body.status : null;