fix inconsistent store pointers between the region-cache and store-cache (#1826)

[ti-chi-bot]

This is an automated cherry-pick of #1826

fix #1823

Summary by CodeRabbit

• Refactor

  • Store metadata handling made thread-safe; metadata updates now occur in-place and logging/address/type reporting improved.

• Bug Fixes

  • Address and label changes no longer disrupt replica references or selection stability during restarts and re-resolves.

• Tests

  • Tests updated and extended to cover address/label updates, restart scenarios, and leader/proxy selection consistency.

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[ti-chi-bot]

@zyguan This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

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[zyguan]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cfzjywxk, zyguan

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• OWNERS [cfzjywxk,zyguan]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-02-06 07:56:21.800631797 +0000 UTC m=+426452.902030513: ☑️ agreed by zyguan.
• 2026-02-06 08:39:35.921653154 +0000 UTC m=+1952.227510525: ☑️ agreed by cfzjywxk.

[zyguan]

/unhold