feat(server): lifespan redesign with server-scoped and session-scoped lifetimes #861

Job	Run time
checks / pre-commit	24s
checks / readme-snippets	11s
checks / test (3.11, lowest-direct, ubuntu-latest)	5m 11s
checks / test (3.13, locked, ubuntu-latest)	4m 11s
checks / test (3.10, lowest-direct, ubuntu-latest)	4m 58s
checks / test (3.13, lowest-direct, windows-latest)	5m 15s
checks / test (3.13, lowest-direct, ubuntu-latest)	4m 55s
checks / test (3.10, locked, windows-latest)	6m 5s
checks / test (3.14, lowest-direct, windows-latest)	6m 20s
checks / test (3.11, locked, ubuntu-latest)	4m 13s
checks / test (3.10, lowest-direct, windows-latest)	4m 55s
checks / test (3.11, locked, windows-latest)	5m 11s
checks / test (3.12, lowest-direct, ubuntu-latest)	4m 57s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 42s
checks / test (3.14, locked, ubuntu-latest)	5m 55s
checks / test (3.12, locked, ubuntu-latest)	4m 19s
checks / test (3.10, locked, ubuntu-latest)	4m 17s
checks / test (3.13, locked, windows-latest)	5m 12s
checks / test (3.12, lowest-direct, windows-latest)	5m 57s
checks / test (3.11, lowest-direct, windows-latest)	5m 33s
checks / test (3.12, locked, windows-latest)	5m 44s
checks / test (3.14, locked, windows-latest)	6m 54s
all-green	2s
	1h 46m 21s

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