feat(keys): paste-your-key field — snippets carry the real key instantly

Next to the copy button: a key input and an «Insert key» button (Enter works
too). The pasted key substitutes into every harness/SDK snippet immediately
and survives tab and OS switches; a freshly created key pre-fills the field.
No more copying a snippet and then hand-editing the placeholder. 2 strings
×7 languages.

web/js/i18n/de.js

@@ -644,4 +644,6 @@ export default {
   "keys.budgetOf": "Budget {b}/Mon.",
   "dash.kpi.orBalance": "OpenRouter-Guthaben",
   "keys.h.install": "Installieren:",
+  "keys.snip.keyInputPh": "API-Schlüssel einfügen",
+  "keys.snip.apply": "Schlüssel einsetzen",
 };

web/js/i18n/en.js

@@ -637,4 +637,6 @@ export default {
   "keys.budgetOf": "budget {b}/mo",
   "dash.kpi.orBalance": "OpenRouter balance",
   "keys.h.install": "Install:",
+  "keys.snip.keyInputPh": "paste your API key",
+  "keys.snip.apply": "Insert key",
 };

web/js/i18n/es.js

@@ -644,4 +644,6 @@ export default {
   "keys.budgetOf": "presupuesto {b}/mes",
   "dash.kpi.orBalance": "Saldo OpenRouter",
   "keys.h.install": "Instalar:",
+  "keys.snip.keyInputPh": "pega tu clave API",
+  "keys.snip.apply": "Insertar clave",
 };

web/js/i18n/fr.js

@@ -644,4 +644,6 @@ export default {
   "keys.budgetOf": "budget {b}/mois",
   "dash.kpi.orBalance": "Solde OpenRouter",
   "keys.h.install": "Installer :",
+  "keys.snip.keyInputPh": "collez votre clé API",
+  "keys.snip.apply": "Insérer la clé",
 };

web/js/i18n/ru.js

@@ -636,4 +636,6 @@ export default {
   "keys.budgetOf": "бюджет {b}/мес",
   "dash.kpi.orBalance": "Баланс OpenRouter",
   "keys.h.install": "Установить:",
+  "keys.snip.keyInputPh": "вставьте ваш API-ключ",
+  "keys.snip.apply": "Вставить ключ",
 };

web/js/i18n/tr.js

@@ -644,4 +644,6 @@ export default {
   "keys.budgetOf": "bütçe {b}/ay",
   "dash.kpi.orBalance": "OpenRouter bakiyesi",
   "keys.h.install": "Kurulum:",
+  "keys.snip.keyInputPh": "API anahtarınızı yapıştırın",
+  "keys.snip.apply": "Anahtarı ekle",
 };

web/js/i18n/zh.js

@@ -644,4 +644,6 @@ export default {
   "keys.budgetOf": "预算 {b}/月",
   "dash.kpi.orBalance": "OpenRouter 余额",
   "keys.h.install": "安装：",
+  "keys.snip.keyInputPh": "粘贴你的 API 密钥",
+  "keys.snip.apply": "插入密钥",
 };