refactor: replace lowlevel Server decorators with on_* constructor kwargs #598

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	22s
checks / test (3.12, locked, windows-latest)	5m 55s
checks / test (3.10, locked, windows-latest)	5m 36s
checks / test (3.12, lowest-direct, windows-latest)	6m 3s
checks / test (3.10, lowest-direct, ubuntu-latest)	4m 58s
checks / test (3.10, lowest-direct, windows-latest)	5m 45s
checks / test (3.11, locked, ubuntu-latest)	4m 50s
checks / test (3.12, lowest-direct, ubuntu-latest)	4m 56s
checks / test (3.14, locked, ubuntu-latest)	6m 20s
checks / test (3.13, lowest-direct, windows-latest)	5m 29s
checks / test (3.11, locked, windows-latest)	5m 28s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 5s
checks / test (3.14, locked, windows-latest)	6m 36s
checks / test (3.13, locked, ubuntu-latest)	4m 46s
checks / test (3.11, lowest-direct, ubuntu-latest)	4m 52s
checks / test (3.14, lowest-direct, windows-latest)	5m 47s
checks / test (3.13, lowest-direct, ubuntu-latest)	5m 0s
checks / test (3.12, locked, ubuntu-latest)	4m 53s
checks / test (3.10, locked, ubuntu-latest)	4m 54s
checks / test (3.11, lowest-direct, windows-latest)	5m 54s
checks / test (3.13, locked, windows-latest)	5m 45s
all-green	5s
	1h 49m 30s

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