refactor: replace lowlevel Server decorators with on_* constructor kwargs #644

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	10s
checks / test (3.10, locked, windows-latest)	2m 14s
checks / test (3.11, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, lowest-direct, ubuntu-latest)	52s
checks / test (3.13, lowest-direct, windows-latest)	2m 35s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.13, locked, windows-latest)	2m 12s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, windows-latest)	3m 42s
checks / test (3.11, locked, windows-latest)	2m 38s
checks / test (3.11, lowest-direct, windows-latest)	2m 38s
checks / test (3.12, locked, windows-latest)	3m 52s
checks / test (3.14, lowest-direct, windows-latest)	2m 17s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.10, lowest-direct, windows-latest)	2m 32s
checks / test (3.14, locked, windows-latest)	3m 10s
checks / test (3.14, locked, ubuntu-latest)	2m 17s
all-green	5s
	38m 33s

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