refactor: replace lowlevel Server decorators with on_* constructor kwargs #460

Job	Run time
checks / pre-commit	18s
checks / readme-snippets	11s
checks / test (3.10, lowest-direct, ubuntu-latest)	5m 36s
checks / test (3.11, lowest-direct, ubuntu-latest)	4m 52s
checks / test (3.14, lowest-direct, ubuntu-latest)	6m 0s
checks / test (3.10, locked, ubuntu-latest)	4m 53s
checks / test (3.11, locked, windows-latest)	5m 57s
checks / test (3.10, lowest-direct, windows-latest)	6m 35s
checks / test (3.13, lowest-direct, ubuntu-latest)	4m 48s
checks / test (3.13, locked, ubuntu-latest)	4m 55s
checks / test (3.12, locked, windows-latest)	6m 1s
checks / test (3.11, lowest-direct, windows-latest)	5m 41s
checks / test (3.12, locked, ubuntu-latest)	4m 54s
checks / test (3.14, locked, ubuntu-latest)	5m 51s
checks / test (3.13, lowest-direct, windows-latest)	6m 19s
checks / test (3.14, locked, windows-latest)	6m 28s
checks / test (3.12, lowest-direct, ubuntu-latest)	5m 34s
checks / test (3.11, locked, ubuntu-latest)	4m 54s
checks / test (3.12, lowest-direct, windows-latest)	6m 3s
checks / test (3.14, lowest-direct, windows-latest)	6m 0s
checks / test (3.10, locked, windows-latest)	6m 5s
checks / test (3.13, locked, windows-latest)	6m 4s
all-green	4s
	1h 54m 3s

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