[fix](i18n) fix Chinese sidebar translations for current and 4.x

[dataroaring]

Summary

• Add 32 missing Chinese translations for sidebar categories that were displaying English on the zh-CN site (e.g., Performance → 性能优化, Query Performance → 查询性能, Caching → 查询缓存, Join Optimization → Join 优化)
• Remove 48 orphaned translation keys left behind from sidebar restructuring that no longer match any sidebar label (e.g., old Tuning/Tuning Plan/Tuning Execution hierarchy, renamed Distincting Counts → Distinct Counts, Materialize View → Materialized View)
• Applies to both current.json and version-4.x.json

Details

Missing translations added (32)

New sidebar categories from the Performance section restructuring, Ecosystem section, Lakehouse catalogs, and data types that had no Chinese translation:

English	Chinese
Performance	性能优化
Getting Started with Performance Tuning	性能调优入门
Query Performance	查询性能
Schema & Index Optimization	Schema 与索引优化
Materialized View	物化视图
Async Materialized View	异步物化视图
Join Optimization	Join 优化
Caching	查询缓存
Execution Tuning	执行调优
High Concurrency & Point Queries	高并发与点查
Distinct Counts	高效去重
Query Profile & Parameters	查询 Profile 与参数
Load Performance	导入性能
Optimization Technology Principles	优化技术原理
Read-Write Separation	读写分离
BI	BI 工具
SQL Clients	SQL 客户端
More	更多
Variant Functions	VARIANT 函数
Binary Data Type	二进制类型
VARIANT / VARIANT Reference	VARIANT / VARIANT 参考

Proper nouns kept as-is: connector names (Spark/Flink/Kafka), catalog names (Iceberg/Paimon/Hudi/MaxCompute), database names (MySQL/PostgreSQL).

Orphaned keys removed (48)

Translation keys that no longer match any sidebar label due to renames, restructuring, or removal. Examples:

• Async-Materialized View (hyphen removed in sidebar)
• Distincting Counts → renamed to Distinct Counts
• Materialize View → renamed to Materialized View
• VARIANT Functions → case changed to Variant Functions
• Old Performance hierarchy: Queries Acceleration, Tuning, Tuning Plan, Tuning Execution, Performance Tuning Overview
• Removed categories: DDL, DML, Create, Drop, Show, Alter, Load, etc.

Test plan

• Verify Chinese site sidebar renders all categories in Chinese (no English fallback labels)
• Verify English site is unaffected
• Check both /docs/ (current) and /docs/4.x/ versions

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Updates the zh-CN Docusaurus docs sidebar translations to match the latest sidebar category labels for both the current and 4.x doc versions, eliminating English fallbacks and removing unused/orphaned keys.

Changes:

• Add missing zh-CN translations for newly introduced/renamed sidebar categories (notably Performance tuning, Ecosystem, catalogs, and VARIANT-related sections).
• Remove translation keys that no longer correspond to any sidebar label after sidebar restructuring/renames.
• Apply the same translation set to both current.json and version-4.x.json for consistency.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
i18n/zh-CN/docusaurus-plugin-content-docs/current.json	Adds missing sidebar category translations and removes orphaned keys for the current docs version.
i18n/zh-CN/docusaurus-plugin-content-docs/version-4.x.json	Mirrors the same sidebar translation additions/removals for the 4.x docs version.

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