Stop advertising MCP_* env vars for MCPServer settings; drop pydantic-settings #3640

Job	Run time
checks / docs	1m 6s
checks / pre-commit	50s
checks / readme-snippets	12s
checks / test (3.10, locked, ubuntu-latest)	1m 32s
checks / test (3.11, locked, ubuntu-latest)	1m 25s
checks / test (3.12, lowest-direct, windows-latest)	2m 5s
checks / test (3.12, locked, ubuntu-latest)	1m 39s
checks / test (3.10, locked, windows-latest)	2m 5s
checks / test (3.11, locked, windows-latest)	1m 51s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.13, lowest-direct, windows-latest)	1m 58s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.12, locked, windows-latest)	1m 59s
checks / test (3.14, lowest-direct, windows-latest)	2m 32s
checks / test (3.10, lowest-direct, windows-latest)	1m 49s
checks / test (3.11, lowest-direct, windows-latest)	2m 0s
checks / test (3.13, locked, ubuntu-latest)	1m 16s
checks / test (3.13, locked, windows-latest)	1m 51s
checks / test (3.14, locked, ubuntu-latest)	1m 19s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.14, locked, windows-latest)	1m 54s
all-green	3s
	35m 53s

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