refactor: replace lowlevel Server decorators with on_* constructor kwargs #601

Job	Run time
checks / pre-commit	21s
checks / test (3.12, locked, windows-latest)	6m 5s
checks / test (3.11, lowest-direct, windows-latest)	5m 41s
checks / test (3.12, locked, ubuntu-latest)	5m 34s
checks / test (3.13, lowest-direct, ubuntu-latest)	4m 59s
checks / test (3.13, locked, windows-latest)	5m 56s
checks / test (3.12, lowest-direct, windows-latest)	6m 9s
checks / test (3.11, locked, ubuntu-latest)	4m 55s
checks / test (3.10, locked, windows-latest)	5m 20s
checks / test (3.12, lowest-direct, ubuntu-latest)	4m 57s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 12s
checks / test (3.10, lowest-direct, windows-latest)	5m 46s
checks / test (3.10, locked, ubuntu-latest)	4m 52s
checks / test (3.13, locked, ubuntu-latest)	4m 46s
checks / test (3.11, lowest-direct, ubuntu-latest)	5m 35s
checks / test (3.14, locked, windows-latest)	7m 13s
checks / test (3.14, locked, ubuntu-latest)	6m 20s
checks / readme-snippets	11s
checks / test (3.14, lowest-direct, windows-latest)	5m 46s
checks / test (3.11, locked, windows-latest)	5m 23s
checks / test (3.13, lowest-direct, windows-latest)	5m 37s
checks / test (3.10, lowest-direct, ubuntu-latest)	5m 5s
all-green	3s
	1h 51m 46s

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