Refactor: split services.py into services/ package

ChatService → services/chat.py
DocumentService → services/document.py
TTSService → services/tts.py
services/__init__.py re-exports all three for backward-compatible imports

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.idea/.gitignore

@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml