*: convert remaining sequence diagrams from PNG to Mermaid#22708
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This pull request replaces static images with Mermaid sequence diagrams in the documentation for BR log backup, snapshot backup and restore, DM pessimistic shard merging, and pessimistic transactions. These changes improve the maintainability of the architectural diagrams. I have no feedback to provide.
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Co-authored-by: Aolin <aolinz@outlook.com>
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What is changed, added or deleted? (Required)
The remaining images which are obviously sequence diagrams are converted to mermaid. Totally 8 images are found from 4 pages.
br/br-log-architecture.md("BR log backup process design" & "Point-in-time recovery process design")br/br-snapshot-architecture.md("snapshot backup process design" & "snapshot restore process design")dm/feature-shard-merge-pessimistic.md("shard-ddl-flow")pessimistic-transaction.md("TiDB pessimistic transaction commit process" & "Pessimistic transactions in TiDB" & "Pipelined pessimistic lock")Which TiDB version(s) do your changes apply to? (Required)
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