fix: exit cleanly on stdio KeyboardInterrupt#2671
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Fixes #2663. Handles Ctrl-C for FastMCP stdio runs at the stdio transport boundary so shutdown does not print a traceback. HTTP transports keep their existing behavior. Validation: uv run pytest tests\server\mcpserver\test_server.py::TestServer::test_run_stdio_exits_cleanly_on_keyboard_interrupt -q; uv run pytest tests\server\mcpserver\test_server.py -q; uv run python -m py_compile src\mcp\server\mcpserver\server.py tests\server\mcpserver\test_server.py; uv run ruff check src\mcp\server\mcpserver\server.py tests\server\mcpserver\test_server.py; uv run ruff format --check src\mcp\server\mcpserver\server.py tests\server\mcpserver\test_server.py; git diff --check.