Revert `mount_path` parameter from `FastMCP` #117

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	33s
checks / test (3.10, locked, windows-latest)	2m 7s
checks / test (3.10, locked, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, windows-latest)	2m 35s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.10, lowest-direct, windows-latest)	2m 15s
checks / test (3.12, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, windows-latest)	3m 17s
checks / test (3.13, lowest-direct, ubuntu-latest)	41s
checks / test (3.13, lowest-direct, windows-latest)	2m 23s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.11, locked, windows-latest)	2m 28s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, windows-latest)	2m 22s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.13, locked, windows-latest)	2m 18s
checks / test (3.14, locked, ubuntu-latest)	2m 24s
checks / test (3.13, locked, ubuntu-latest)	42s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, locked, windows-latest)	3m 43s
checks / test (3.14, locked, windows-latest)	3m 19s
all-green	3s
	37m 16s

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