Auto-Context: Semantische Kontext-Injektion, Memory-File-Embeddings, Agent-Toggle

- Automatische Embedding-basierte Kontext-Injektion vor jeder API-Anfrage
  (Top 5 Chat-Ergebnisse + Top 3 Memory-File-Treffer als recalled_context)
- Memory-Dateien (.md) werden embedded (Backfill + Live nach memory_write)
- Neue Agent-Option 'useAutoContext' (Checkbox, Default: aktiviert)
- VectorSearchService: SearchMemoryFilesAsync, EmbedMemoryFileAsync, Chunking
- EmbeddingBackgroundService: Memory-File-Backfill + EnqueueMemoryFile
- ToolService: memory_write löst Re-Embedding aus
- embeddingBg Parameter an ExecuteTool durchgereicht

wwwroot/js/pages/agent-page.js

@@ -24,6 +24,7 @@ registerPage('agent', {
     const useIdentityEl = document.getElementById('agentUseIdentity');
     const useUserInfoEl = document.getElementById('agentUseUserInfo');
     const useMemoryEl = document.getElementById('agentUseMemory');
+    const useAutoContextEl = document.getElementById('agentUseAutoContext');
     const webSearchVersionEl = document.getElementById('agentWebSearchVersion');
     const avatarPreview = document.getElementById('avatarPreview');
     const saveBtn = document.getElementById('agentSaveBtn');
@@ -64,6 +65,7 @@ registerPage('agent', {
       useIdentityEl.checked = agent.useIdentity !== false;
       useUserInfoEl.checked = agent.useUserInfo !== false;
       useMemoryEl.checked = agent.useMemory !== false;
+      useAutoContextEl.checked = agent.useAutoContext !== false;
       webSearchVersionEl.value = agent.webSearchVersion || '';
       isPublicEl.checked = agent.isPublic || false;
       deleteBtn.hidden = false;
@@ -105,6 +107,7 @@ registerPage('agent', {
         useIdentity: useIdentityEl.checked,
         useUserInfo: useUserInfoEl.checked,
         useMemory: useMemoryEl.checked,
+        useAutoContext: useAutoContextEl.checked,
         webSearchVersion: webSearchVersionEl.value,
         avatar: _agentAvatarEditor.getImage(),
         avatarScale: _agentAvatarEditor.getScale(),