refactor: replace lowlevel Server decorators with on_* constructor kwargs #637

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	35s
checks / test (3.10, lowest-direct, ubuntu-latest)	4m 38s
checks / test (3.11, lowest-direct, ubuntu-latest)	4m 35s
checks / test (3.12, locked, windows-latest)	5m 44s
checks / test (3.13, lowest-direct, windows-latest)	5m 52s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 42s
checks / test (3.13, locked, windows-latest)	5m 40s
checks / test (3.12, locked, ubuntu-latest)	4m 43s
checks / test (3.12, lowest-direct, windows-latest)	5m 48s
checks / test (3.10, locked, ubuntu-latest)	4m 38s
checks / test (3.13, lowest-direct, ubuntu-latest)	4m 39s
checks / test (3.11, locked, windows-latest)	5m 27s
checks / test (3.14, locked, ubuntu-latest)	6m 49s
checks / test (3.14, locked, windows-latest)	6m 36s
checks / test (3.12, lowest-direct, ubuntu-latest)	5m 0s
checks / test (3.14, lowest-direct, windows-latest)	5m 58s
checks / test (3.11, locked, ubuntu-latest)	4m 57s
checks / test (3.10, lowest-direct, windows-latest)	5m 28s
checks / test (3.11, lowest-direct, windows-latest)	5m 43s
checks / test (3.10, locked, windows-latest)	6m 6s
checks / test (3.13, locked, ubuntu-latest)	4m 33s
all-green	5s
	1h 49m 27s

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