refactor: replace lowlevel Server decorators with on_* constructor kwargs #600

Job	Run time
checks / pre-commit	18s
checks / readme-snippets	9s
checks / test (3.11, lowest-direct, windows-latest)	5m 34s
checks / test (3.12, locked, ubuntu-latest)	4m 59s
checks / test (3.12, locked, windows-latest)	5m 56s
checks / test (3.13, lowest-direct, ubuntu-latest)	4m 49s
checks / test (3.12, lowest-direct, ubuntu-latest)	5m 47s
checks / test (3.12, lowest-direct, windows-latest)	6m 13s
checks / test (3.13, locked, windows-latest)	5m 28s
checks / test (3.14, lowest-direct, windows-latest)	5m 42s
checks / test (3.10, lowest-direct, ubuntu-latest)	4m 58s
checks / test (3.14, locked, ubuntu-latest)	6m 14s
checks / test (3.11, locked, windows-latest)	5m 30s
checks / test (3.14, locked, windows-latest)	6m 31s
checks / test (3.10, locked, windows-latest)	6m 28s
checks / test (3.11, lowest-direct, ubuntu-latest)	4m 57s
checks / test (3.13, locked, ubuntu-latest)	5m 27s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 13s
checks / test (3.13, lowest-direct, windows-latest)	5m 38s
checks / test (3.10, lowest-direct, windows-latest)	6m 23s
checks / test (3.10, locked, ubuntu-latest)	4m 57s
checks / test (3.11, locked, ubuntu-latest)	4m 47s
all-green	4s
	1h 52m 2s

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