Add Spring Boot sample application for testing failover scenarios#109

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vlsi wants to merge 3 commits intoNetcracker:mainfrom

vlsi:sb_failover

Commits on Mar 27, 2026

feat: replace pod IP with DNS name for Patroni connectivity

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fix: log explicit messages when bootstrap.dcs.standby_cluster can't parse

vlsi
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claude
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test: add example with spring boot application failover
vlsi
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