web: configurable IP TTL / hop-limit / DSCP on listening socket#396

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Commits on May 28, 2026

docs: add design brief for IP socket options (TTL, hop-limit, DSCP)
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web: add IP socket-options config plumbing (FlagConfig, IPSocketConfig)
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web: apply IP socket options on the listening socket and accepted conns
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web: tests for IP socket options (validation + Linux inheritance)
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web: docs and example for ip_socket_config
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[optional] web: refactor handler_test.go to table-driven
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web: validate DSCP flag value at resolve time
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