refactor: replace lowlevel Server decorators with on_* constructor kwargs #647

Job	Run time
checks / pre-commit	31s
checks / readme-snippets	12s
checks / test (3.10, locked, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, windows-latest)	3m 40s
checks / test (3.12, locked, windows-latest)	3m 42s
checks / test (3.11, locked, windows-latest)	2m 41s
checks / test (3.11, locked, ubuntu-latest)	44s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.10, locked, windows-latest)	2m 13s
checks / test (3.12, lowest-direct, ubuntu-latest)	52s
checks / test (3.13, locked, ubuntu-latest)	42s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, locked, windows-latest)	2m 28s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.10, lowest-direct, windows-latest)	2m 32s
checks / test (3.12, lowest-direct, windows-latest)	3m 46s
checks / test (3.13, lowest-direct, windows-latest)	2m 32s
checks / test (3.14, lowest-direct, windows-latest)	2m 28s
checks / test (3.14, locked, ubuntu-latest)	2m 17s
checks / test (3.14, locked, windows-latest)	3m 23s
all-green	2s
	39m 48s

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