refactor: replace lowlevel Server decorators with on_* constructor kwargs #657

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	1m 6s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.14, locked, ubuntu-latest)	2m 17s
checks / test (3.13, locked, windows-latest)	2m 19s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.14, lowest-direct, windows-latest)	2m 19s
checks / test (3.10, lowest-direct, ubuntu-latest)	55s
checks / test (3.12, lowest-direct, ubuntu-latest)	54s
checks / test (3.12, locked, windows-latest)	3m 52s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, windows-latest)	2m 34s
checks / test (3.10, lowest-direct, windows-latest)	2m 26s
checks / test (3.14, locked, windows-latest)	3m 18s
checks / test (3.11, locked, windows-latest)	2m 32s
checks / test (3.13, lowest-direct, windows-latest)	2m 44s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.13, lowest-direct, ubuntu-latest)	51s
checks / test (3.10, locked, windows-latest)	2m 15s
checks / test (3.12, lowest-direct, windows-latest)	3m 25s
checks / test (3.12, locked, ubuntu-latest)	58s
checks / test (3.10, locked, ubuntu-latest)	52s
all-green	5s
	39m 40s

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