feat: Add CORS configuration for browser-based MCP clients #2490

Job	Run time
checks / pre-commit	22s
checks / readme-snippets	11s
checks / test (3.10, lowest-direct, ubuntu-latest)	33s
checks / test (3.10, highest, windows-latest)	1m 23s
checks / test (3.10, highest, ubuntu-latest)	35s
checks / test (3.10, lowest-direct, windows-latest)	1m 5s
checks / test (3.11, lowest-direct, windows-latest)	1m 12s
checks / test (3.11, lowest-direct, ubuntu-latest)	35s
checks / test (3.12, lowest-direct, ubuntu-latest)	31s
checks / test (3.11, highest, ubuntu-latest)	32s
checks / test (3.12, highest, windows-latest)	1m 14s
checks / test (3.11, highest, windows-latest)	1m 14s
checks / test (3.13, lowest-direct, ubuntu-latest)	34s
checks / test (3.13, highest, windows-latest)	1m 32s
checks / test (3.13, highest, ubuntu-latest)	33s
checks / test (3.12, highest, ubuntu-latest)	32s
checks / test (3.13, lowest-direct, windows-latest)	1m 18s
checks / test (3.12, lowest-direct, windows-latest)	1m 14s
	15m 10s

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