refactor: replace lowlevel Server decorators with on_* constructor kwargs #459

Job	Run time
checks / pre-commit	16s
checks / test (3.11, lowest-direct, ubuntu-latest)	5m 33s
checks / test (3.10, lowest-direct, ubuntu-latest)	4m 48s
checks / test (3.10, lowest-direct, windows-latest)	5m 49s
checks / test (3.11, locked, windows-latest)	6m 5s
checks / readme-snippets	12s
checks / test (3.12, lowest-direct, ubuntu-latest)	5m 32s
checks / test (3.12, locked, windows-latest)	6m 2s
checks / test (3.10, locked, ubuntu-latest)	4m 48s
checks / test (3.11, locked, ubuntu-latest)	4m 48s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 30s
checks / test (3.13, lowest-direct, ubuntu-latest)	4m 49s
checks / test (3.12, lowest-direct, windows-latest)	6m 2s
checks / test (3.13, locked, windows-latest)	6m 8s
checks / test (3.13, locked, ubuntu-latest)	4m 57s
checks / test (3.14, locked, windows-latest)	6m 32s
checks / test (3.10, locked, windows-latest)	6m 21s
checks / test (3.12, locked, ubuntu-latest)	5m 35s
checks / test (3.14, locked, ubuntu-latest)	5m 51s
checks / test (3.14, lowest-direct, windows-latest)	6m 12s
checks / test (3.11, lowest-direct, windows-latest)	5m 37s
checks / test (3.13, lowest-direct, windows-latest)	6m 10s
all-green	3s
	1h 53m 40s

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