Feat(router service): implement grpc function

[bufferflies]

What problem does this PR solve?

Issue Number: Ref #9212

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[codecov[bot]]

Codecov Report

:x: Patch coverage is 53.21337% with 182 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 78.60%. Comparing base (a749e77) to head (96f8937). :warning: Report is 6 commits behind head on master.

:x: Your patch status has failed because the patch coverage (53.21%) is below the target coverage (74.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9723      +/-   ##
==========================================
- Coverage   78.68%   78.60%   -0.08%     
==========================================
  Files         492      494       +2     
  Lines       66274    66299      +25     
==========================================
- Hits        52148    52115      -33     
- Misses      10418    10467      +49     
- Partials     3708     3717       +9     

Flag	Coverage Δ
unittests	78.60% <53.21%> (-0.08%)	:arrow_down:

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[bufferflies]

/test pull-unit-test-next-gen

[bufferflies]

/ping @rleungx @okJiang

[ti-chi-bot[bot]]

@bufferflies: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
non-block/pull-unit-test-next-gen	050093dee7ea2848f0a00b686a0de1c8e3c9c503	link	false	/test pull-unit-test-next-gen

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[bufferflies]

/test pull-unit-test-next-gen

[bufferflies]

/test pull-integration-realcluster-test

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: okJiang, rleungx

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• ~~OWNERS~~ [rleungx]

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-10-29 09:42:44.62911585 +0000 UTC m=+1469670.706368410: :ballot_box_with_check: agreed by okJiang.
• 2025-11-05 02:56:04.972749804 +0000 UTC m=+238814.415779673: :ballot_box_with_check: agreed by rleungx.