refactor: replace lowlevel Server decorators with on_* constructor kwargs #607

Job	Run time
checks / pre-commit	33s
checks / test (3.14, locked, windows-latest)	7m 15s
checks / test (3.12, locked, ubuntu-latest)	4m 53s
checks / test (3.14, locked, ubuntu-latest)	6m 16s
checks / test (3.11, locked, ubuntu-latest)	4m 46s
checks / test (3.10, lowest-direct, ubuntu-latest)	4m 48s
checks / test (3.12, lowest-direct, ubuntu-latest)	4m 53s
checks / test (3.13, lowest-direct, windows-latest)	5m 54s
checks / test (3.10, locked, ubuntu-latest)	5m 31s
checks / test (3.13, lowest-direct, ubuntu-latest)	4m 49s
checks / test (3.10, locked, windows-latest)	5m 30s
checks / test (3.11, lowest-direct, ubuntu-latest)	5m 28s
checks / test (3.14, lowest-direct, windows-latest)	6m 18s
checks / test (3.13, locked, ubuntu-latest)	4m 48s
checks / test (3.12, lowest-direct, windows-latest)	6m 15s
checks / readme-snippets	15s
checks / test (3.11, lowest-direct, windows-latest)	5m 38s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 9s
checks / test (3.13, locked, windows-latest)	5m 49s
checks / test (3.11, locked, windows-latest)	6m 2s
checks / test (3.12, locked, windows-latest)	6m 54s
checks / test (3.10, lowest-direct, windows-latest)	5m 37s
all-green	4s
	1h 53m 25s

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