refactor: replace lowlevel Server decorators with on_* constructor kwargs #649

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	33s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.12, locked, ubuntu-latest)	58s
checks / test (3.10, locked, windows-latest)	2m 24s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, lowest-direct, ubuntu-latest)	54s
checks / test (3.14, locked, ubuntu-latest)	2m 15s
checks / test (3.11, locked, ubuntu-latest)	50s
checks / test (3.12, lowest-direct, windows-latest)	3m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.11, lowest-direct, windows-latest)	2m 40s
checks / test (3.10, lowest-direct, windows-latest)	2m 28s
checks / test (3.14, locked, windows-latest)	4m 37s
checks / test (3.13, locked, windows-latest)	2m 37s
checks / test (3.13, lowest-direct, windows-latest)	2m 41s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.12, locked, windows-latest)	3m 9s
checks / test (3.11, locked, windows-latest)	3m 30s
checks / test (3.14, lowest-direct, windows-latest)	2m 25s
all-green	4s
	41m 21s

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