refactor: replace lowlevel Server decorators with on_* constructor kwargs #643

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	12s
checks / test (3.12, lowest-direct, windows-latest)	3m 34s
checks / test (3.10, lowest-direct, windows-latest)	2m 39s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, locked, ubuntu-latest)	50s
checks / test (3.11, lowest-direct, windows-latest)	2m 22s
checks / test (3.12, locked, windows-latest)	3m 16s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.10, locked, windows-latest)	2m 13s
checks / test (3.13, lowest-direct, windows-latest)	2m 46s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.11, locked, windows-latest)	2m 39s
checks / test (3.11, lowest-direct, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, ubuntu-latest)	49s
checks / test (3.14, locked, windows-latest)	2m 57s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.13, locked, windows-latest)	2m 50s
checks / test (3.14, lowest-direct, windows-latest)	2m 25s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.14, locked, ubuntu-latest)	2m 13s
checks / test (3.12, lowest-direct, ubuntu-latest)	49s
all-green	5s
	38m 11s

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