feat: Serper Web Search als Agent-Tool

- ToolService: serper_web_search Tool-Definition + ExecuteSerperWebSearch()
  Google-Suche via Serper.dev API mit Titel, Link, Snippet
  Knowledge Graph + Answer Box + organische Ergebnisse
- AgentRecord: UseSerperSearch Property (Default: false)
- DB-Migration: use_serper_search Spalte
- AnthropicService + ChatService: useSerperSearch Parameter durchreichen
- ChatEndpoint + AgentEndpoint: useSerperSearch in API
- Frontend: Checkbox, Badge (Serper Search), laden/speichern
- Aktivierung: Agent-Checkbox + SerperApiKey in Server-Einstellungen

wwwroot/index.html

@@ -245,6 +245,10 @@
               <input type="checkbox" id="agentUseGitHubSearch">
               GitHub Code Search <span class="checkbox-hint">(Öffentlichen Code auf GitHub durchsuchen)</span>
             </label>
+            <label class="checkbox-label">
+              <input type="checkbox" id="agentUseSerperSearch">
+              Serper Web Search <span class="checkbox-hint">(Google-Suche via Serper.dev API)</span>
+            </label>
             <label>Web-Suche</label>
             <select id="agentWebSearchVersion">
               <option value="">Deaktiviert</option>

wwwroot/js/cards.js

@@ -109,6 +109,7 @@ function buildAgentCard(agent, skills) {
   if (agent.useMemory) badges.push('<span class="badge badge-feature" title="Zugriff auf Erinnerungen (Memory-Tools)"><i class="fa fa-database"></i> Erinnerungen</span>');
   if (agent.useAutoContext) badges.push('<span class="badge badge-feature" title="Relevante Erinnerungen werden automatisch abgerufen"><i class="fa fa-magic"></i> Auto-Kontext</span>');
   if (agent.useGitHubSearch) badges.push('<span class="badge badge-feature" title="Öffentlichen Code auf GitHub durchsuchen"><i class="fa fa-github"></i> GitHub Search</span>');
+  if (agent.useSerperSearch) badges.push('<span class="badge badge-feature" title="Google-Suche via Serper.dev API"><i class="fa fa-google"></i> Serper Search</span>');
   if (agent.webSearchVersion) {
     const wsYear = agent.webSearchVersion.includes('2025') ? 'Version 2025' : 'v2026';
     badges.push(`<span class="badge badge-feature" title="Web-Suche - ${wsYear}"><i class="fa fa-search"></i> Web-Suche</span>`);

wwwroot/js/pages/agent-page.js

@@ -54,6 +54,7 @@ registerPage('agent', {
     const useMemoryEl = document.getElementById('agentUseMemory');
     const useAutoContextEl = document.getElementById('agentUseAutoContext');
     const useGitHubSearchEl = document.getElementById('agentUseGitHubSearch');
+    const useSerperSearchEl = document.getElementById('agentUseSerperSearch');
     const webSearchVersionEl = document.getElementById('agentWebSearchVersion');
     const avatarPreview = document.getElementById('avatarPreview');
     const saveBtn = document.getElementById('agentSaveBtn');
@@ -96,6 +97,7 @@ registerPage('agent', {
       useMemoryEl.checked = agent.useMemory !== false;
       useAutoContextEl.checked = agent.useAutoContext !== false;
       useGitHubSearchEl.checked = agent.useGitHubSearch || false;
+      useSerperSearchEl.checked = agent.useSerperSearch || false;
       webSearchVersionEl.value = agent.webSearchVersion || '';
       isPublicEl.checked = agent.isPublic || false;
       deleteBtn.hidden = false;
@@ -139,6 +141,7 @@ registerPage('agent', {
         useMemory: useMemoryEl.checked,
         useAutoContext: useAutoContextEl.checked,
         useGitHubSearch: useGitHubSearchEl.checked,
+        useSerperSearch: useSerperSearchEl.checked,
         webSearchVersion: webSearchVersionEl.value,
         avatar: _agentAvatarEditor.getImage(),
         avatarScale: _agentAvatarEditor.getScale(),