docs(transfer): document SQLite PVC deployment (#1040)

[jlon]

Summary

Document the chart-managed PVC used by the default single-replica SQLite Transfer store.

Issue Describe / Design

Related to CurvineIO/curvine#1040 and CurvineIO/curvine-helm#52.

An empty transfer.storeUrl now uses a ReadWriteOnce PVC selected by the cluster default StorageClass. The documentation distinguishes this durable single-replica mode from MySQL, which is required for multiple Transfer replicas and recommended for high availability.

Changes

Module / File	Change	Impact on existing behavior
2-Deploy/.../01-k8s-Deployment.md	Document the default SQLite PVC, capacity, Recreate strategy, and retention on uninstall.	Corrects prior emptyDir guidance.
2-Deploy/.../03-conf.md	Clarify SQLite and MySQL deployment boundaries.	No runtime behavior change.
Chinese mirrors	Keep Kubernetes and configuration guidance aligned.	None.

Test verified

Test case	Result	Notes
git diff --check	PASS	No whitespace errors.
npm run build	PASS	English and Chinese Docusaurus sites built successfully. Existing blog, anchor, and Browserslist warnings remain.

Dependencies

• Related PRs: feat(runtime): deploy standalone transfer service (#1040) curvine-helm#52
• Related issues: [FEATURE] Decouple LoadJob execution from master curvine#1040
• Blocks / blocked by: None