Make fastapi.cli a runnable module (#2532)

Co-authored-by: Jeremiah Lowin <[email protected]>

Author: paulo-raca

src/fastmcp/cli/__init__.py

@@ -1,6 +1,3 @@
 """FastMCP CLI package."""
 
 from .cli import app
-
-if __name__ == "__main__":
-    app()

src/fastmcp/cli/__main__.py

@@ -0,0 +1,5 @@
+"""FastMCP CLI as a runnable package"""
+
+from .cli import app
+
+app()