[PR] feat: persist instances and scope topics/groups by instance [rocketmq-dashboard]

["lizhimins (via GitHub)" <gi...@apache.org>]

lizhimins opened a new pull request, #951:
URL: https://github.com/apache/rocketmq-dashboard/pull/951

   ## Summary
   
   - Add the `rmq_instance` table with five demo instances (two direct, three proxy) behind a MyBatis-Plus repository, replacing the in-memory instance store so instance data survives restarts.
   - Topics and consumer groups gain an `instance_id` column; instance pages now report real per-instance topic/group counts via `GROUP BY`, and the five instance sub-pages (topic/group/message/acl/dlq) share a `useInstanceFilter` hook with instance-scoped routes (`/instance/:instanceId/<section>`).
   - Drop the namespace concept from topic/group UI and forms.
   - Query topic consumers through `queryTopicConsumeByWho` instead of scanning every subscription group, which flooded the topic detail with system groups.
   - Tidy the message query layout: instance selector and query mode on one row; remove the tag filter from topic-mode queries.
   - Includes the idempotent `upgrade-demo-instance.sql` migration for existing MySQL volumes.
   
   ## Test plan
   
   - [x] Backend: `mvn clean package` all tests pass (543 cases at integration time)
   - [x] Frontend: affected vitest suites pass, `npm run build` passes
   - [x] Deployed and verified against a live MySQL volume + real API responses


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Re: [PR] feat: persist instances and scope topics/groups by instance [rocketmq-dashboard]

["lizhimins (via GitHub)" <gi...@apache.org>]

lizhimins merged PR #951:
URL: https://github.com/apache/rocketmq-dashboard/pull/951


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