Feat/add stdio transport (#25)

* feat: Add stdio transport method.
Update relevant documentation and code to support both SSE and stdio connection methods, initialize the EXCEL_FILES_PATH variable and perform the corresponding path handling.

* Remove PyPI mirror configuration.

src/excel_mcp/__main__.py

@@ -1,13 +1,19 @@
 import asyncio
-from .server import run_server
+import typer
+from typing import Optional
 
-def main():
-    """Start the Excel MCP server."""
+from .server import run_sse, run_stdio
+
+app = typer.Typer(help="Excel MCP Server")
+
+@app.command()
+def sse():
+    """Start Excel MCP Server in SSE mode"""
+    print("Excel MCP Server - SSE mode")
+    print("----------------------")
+    print("Press Ctrl+C to exit")
     try:
-        print("Excel MCP Server")
-        print("---------------")
-        print("Starting server... Press Ctrl+C to exit")
-        asyncio.run(run_server())
+        asyncio.run(run_sse())
     except KeyboardInterrupt:
         print("\nShutting down server...")
     except Exception as e:
@@ -15,7 +21,21 @@ def main():
         import traceback
         traceback.print_exc()
     finally:
-        print("Server stopped.")
+        print("Service stopped.")
+
+@app.command()
+def stdio():
+    """Start Excel MCP Server in stdio mode"""
+    try:
+        run_stdio()
+    except KeyboardInterrupt:
+        print("\nShutting down server...")
+    except Exception as e:
+        print(f"\nError: {e}")
+        import traceback
+        traceback.print_exc()
+    finally:
+        print("Service stopped.")
 
 if __name__ == "__main__":
-    main() 
+    app()