docs: explain Store callback queue safety

[imbajin]

The RPC lifecycle fix keeps Store cancellation and completion callbacks on an unbounded dispatch queue, so a configured bounded queue no longer applies to that callback path. This updates the Chinese and English configuration guidance, explains core/max and backlog behaviour, and preserves the behaviour of versions without the fix.

Paired with hugegraph/hugegraph#280 and apache/hugegraph#3303; coordinate the code and documentation merges. Only the Store guidance is changed: PD queue configuration is unchanged.

Validation: reviewed the two-file diff, bilingual parity, Markdown table boundaries and the linked code PR.

The org review uses an ASF-base snapshot so unrelated org website changes do not enter this diff.

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-09T21:04:07.531258Z	12141c8	PR opened

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