refactor: replace lowlevel Server decorators with on_* constructor kw… #660

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	36s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
checks / test (3.10, lowest-direct, windows-latest)	2m 50s
checks / test (3.11, lowest-direct, ubuntu-latest)	52s
checks / test (3.12, locked, windows-latest)	3m 34s
checks / test (3.10, locked, windows-latest)	2m 16s
checks / test (3.10, locked, ubuntu-latest)	56s
checks / test (3.13, locked, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, windows-latest)	2m 32s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 24s
checks / test (3.11, locked, ubuntu-latest)	51s
checks / test (3.11, locked, windows-latest)	2m 36s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, windows-latest)	3m 40s
checks / test (3.11, lowest-direct, windows-latest)	2m 49s
checks / test (3.14, locked, ubuntu-latest)	2m 20s
checks / test (3.10, lowest-direct, ubuntu-latest)	53s
checks / test (3.14, locked, windows-latest)	3m 28s
checks / test (3.14, lowest-direct, windows-latest)	2m 24s
checks / test (3.13, lowest-direct, ubuntu-latest)	52s
checks / test (3.13, locked, windows-latest)	2m 40s
all-green	42s
	41m 8s

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