refactor: replace lowlevel Server decorators with on_* constructor kwargs #642

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	12s
checks / test (3.11, lowest-direct, windows-latest)	2m 40s
checks / test (3.11, lowest-direct, ubuntu-latest)	41s
checks / test (3.12, locked, windows-latest)	3m 21s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, lowest-direct, windows-latest)	3m 50s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.10, locked, windows-latest)	2m 19s
checks / test (3.12, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, locked, windows-latest)	2m 21s
checks / test (3.14, lowest-direct, windows-latest)	2m 18s
checks / test (3.13, lowest-direct, windows-latest)	2m 42s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.14, locked, ubuntu-latest)	2m 13s
checks / test (3.13, locked, windows-latest)	2m 21s
checks / test (3.12, locked, ubuntu-latest)	47s
checks / test (3.14, locked, windows-latest)	2m 59s
checks / test (3.10, locked, ubuntu-latest)	42s
checks / test (3.11, locked, ubuntu-latest)	43s
checks / test (3.10, lowest-direct, windows-latest)	2m 24s
all-green	3s
	37m 9s

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