feat: add index to some metadb tables

[ZhengYa-0110]

This PR is for:

• Server

Affected branches

• main
• v7.1
• v6.6

[ZhengYa-0110]

@claude review

[claude]

Claude finished @ZhengYa-0110's task in 20m 19s —— View job

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GENERAL_COMMENT on PR #11533. The trigger request is code review only (`@claude review`). I reviewed the changed schema/version files and relevant recorder/migrator code paths that depend on `lcuuid` lookups.

Progress

• Review repository instructions and PR context
• Inspect changed files and diff against origin/v6.6
• Assess correctness, safety, and migration behavior
• Post review feedback

Review

No blocking issues found.

• server/controller/db/metadb/migrator/schema/rawsql/mysql/ddl_create_table.sql:1127, server/controller/db/metadb/migrator/schema/rawsql/mysql/ddl_create_table.sql:1143, server/controller/db/metadb/migrator/schema/rawsql/mysql/ddl_create_table.sql:1204, and server/controller/db/metadb/migrator/schema/rawsql/mysql/ddl_create_table.sql:1271 add lcuuid indexes for fresh installs on the same four tables that the upgrade script updates in server/controller/db/metadb/migrator/schema/rawsql/mysql/issu/6.6.1.68.sql:28-31, so new and upgraded deployments stay aligned.
• The migration logic in server/controller/db/metadb/migrator/schema/rawsql/mysql/issu/6.6.1.68.sql:11-21 checks information_schema.statistics before issuing ALTER TABLE, which keeps the change idempotent and avoids creating a duplicate index under a different name on partially patched environments.
• The version bump is consistent between server/controller/db/metadb/migrator/schema/const.go:23 and server/controller/db/metadb/migrator/schema/rawsql/mysql/issu/6.6.1.68.sql:35.
• The added indexes match existing lcuuid lookup patterns in recorder code, for example server/controller/recorder/db/operator.go:101, server/controller/recorder/db/operator.go:113, and server/controller/recorder/db/operator.go:125.

Notes

• Review only; I did not make code changes.
• I did not run the migration against a live MySQL instance as part of this review.