Add type annotation for app variable in server.py

Co-Authored-By: tumf <[email protected]>

Author: devin-ai-integration[bot]

src/mcp_text_editor/server.py

@@ -23,7 +23,7 @@
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger("mcp-text-editor")
 
-app = Server("mcp-text-editor")
+app: Server = Server("mcp-text-editor")
 
 # Initialize tool handlers
 get_contents_handler = GetTextFileContentsHandler()