refactor: replace lowlevel Server decorators with on_* constructor kwargs #608

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	20s
checks / test (3.11, lowest-direct, windows-latest)	5m 52s
checks / test (3.10, lowest-direct, windows-latest)	6m 35s
checks / test (3.10, locked, windows-latest)	5m 21s
checks / test (3.11, lowest-direct, ubuntu-latest)	5m 5s
checks / test (3.11, locked, windows-latest)	5m 36s
checks / test (3.14, lowest-direct, windows-latest)	5m 43s
checks / test (3.12, locked, ubuntu-latest)	4m 55s
checks / test (3.11, locked, ubuntu-latest)	5m 0s
checks / test (3.13, lowest-direct, ubuntu-latest)	4m 53s
checks / test (3.12, lowest-direct, ubuntu-latest)	4m 59s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 9s
checks / test (3.10, locked, ubuntu-latest)	4m 49s
checks / test (3.13, locked, ubuntu-latest)	4m 49s
checks / test (3.13, locked, windows-latest)	5m 51s
checks / test (3.14, locked, ubuntu-latest)	6m 11s
checks / test (3.14, locked, windows-latest)	7m 12s
checks / test (3.12, locked, windows-latest)	5m 57s
checks / test (3.12, lowest-direct, windows-latest)	6m 42s
checks / test (3.13, lowest-direct, windows-latest)	5m 49s
checks / test (3.10, lowest-direct, ubuntu-latest)	5m 0s
all-green	5s
	1h 52m 3s

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