feat(i18n): migrate hardcoded German strings to t() across 104 components/pages — AST-based batch with re-parse gate, 423 new de.json keys; tsc clean; vitest failures byte-identical to clean-tree baseline (pre-existing)

frontend/src/pages/AgentDashboard.tsx

@@ -184,7 +184,7 @@ function AgentForm({
             onChange={(e) => updateField('name', e.target.value)}
             required
             className="w-full rounded-lg border border-secondary-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary-500"
-            placeholder="My Agent"
+            placeholder={t('agentDashboard.myagent')}
           />
         </div>
         <div>
@@ -196,7 +196,7 @@ function AgentForm({
             onChange={(e) => updateField('description', e.target.value)}
             rows={2}
             className="w-full rounded-lg border border-secondary-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary-500"
-            placeholder="Optional description"
+            placeholder={t('agentDashboard.optionaldescription')}
           />
         </div>
       </div>
@@ -213,7 +213,7 @@ function AgentForm({
             onChange={(e) => updateField('model', e.target.value)}
             list="model-suggestions"
             className="flex-1 rounded-lg border border-secondary-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary-500"
-            placeholder="gpt-4"
+            placeholder={t('agentDashboard.gpt4')}
           />
           <datalist id="model-suggestions">
             {commonModels.map((m) => (
@@ -233,7 +233,7 @@ function AgentForm({
           onChange={(e) => updateField('system_prompt', e.target.value)}
           rows={4}
           className="w-full rounded-lg border border-secondary-300 px-3 py-2 text-sm font-mono focus:outline-none focus:ring-2 focus:ring-primary-500"
-          placeholder="You are a helpful assistant..."
+          placeholder={t('agentDashboard.youareahelpfulassistant')}
         />
       </div>