feat(server): lifespan redesign with server-scoped and session-scoped lifetimes #860

Job	Run time
checks / pre-commit	16s
checks / readme-snippets	11s
checks / test (3.11, locked, windows-latest)	5m 14s
checks / test (3.10, locked, ubuntu-latest)	4m 12s
checks / test (3.12, lowest-direct, windows-latest)	6m 24s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 0s
checks / test (3.13, lowest-direct, windows-latest)	6m 17s
checks / test (3.12, locked, ubuntu-latest)	4m 5s
checks / test (3.13, locked, windows-latest)	5m 5s
checks / test (3.11, lowest-direct, windows-latest)	5m 24s
checks / test (3.12, lowest-direct, ubuntu-latest)	5m 3s
checks / test (3.10, lowest-direct, ubuntu-latest)	5m 13s
checks / test (3.10, lowest-direct, windows-latest)	5m 6s
checks / test (3.12, locked, windows-latest)	6m 21s
checks / test (3.13, lowest-direct, ubuntu-latest)	5m 17s
checks / test (3.10, locked, windows-latest)	5m 2s
checks / test (3.11, locked, ubuntu-latest)	4m 34s
checks / test (3.14, lowest-direct, windows-latest)	6m 7s
checks / test (3.11, lowest-direct, ubuntu-latest)	4m 50s
checks / test (3.14, locked, ubuntu-latest)	6m 24s
checks / test (3.14, locked, windows-latest)	5m 50s
checks / test (3.13, locked, ubuntu-latest)	4m 51s
all-green	4s
	1h 46m 50s

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