refactor: replace lowlevel Server decorators with on_* constructor kwargs #577

Job	Run time
checks / pre-commit	36s
checks / readme-snippets	10s
checks / test (3.12, lowest-direct, ubuntu-latest)	5m 3s
checks / test (3.11, locked, windows-latest)	6m 19s
checks / test (3.10, lowest-direct, ubuntu-latest)	4m 50s
checks / test (3.12, locked, windows-latest)	6m 0s
checks / test (3.13, lowest-direct, ubuntu-latest)	4m 55s
checks / test (3.11, locked, ubuntu-latest)	4m 50s
checks / test (3.13, locked, windows-latest)	6m 20s
checks / test (3.14, lowest-direct, windows-latest)	6m 34s
checks / test (3.10, locked, ubuntu-latest)	4m 58s
checks / test (3.11, lowest-direct, ubuntu-latest)	4m 55s
checks / test (3.14, locked, ubuntu-latest)	6m 15s
checks / test (3.13, locked, ubuntu-latest)	4m 46s
checks / test (3.14, locked, windows-latest)	6m 46s
checks / test (3.10, lowest-direct, windows-latest)	6m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 8s
checks / test (3.10, locked, windows-latest)	5m 36s
checks / test (3.12, lowest-direct, windows-latest)	6m 8s
checks / test (3.13, lowest-direct, windows-latest)	5m 43s
checks / test (3.12, locked, ubuntu-latest)	5m 0s
checks / test (3.11, lowest-direct, windows-latest)	5m 53s
all-green	5s
	1h 53m 24s

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