[GH-2867] Translate SQL API overview & concepts to Chinese (Phase 7)

[jiayuasu]

Part of #2867.

Scope

Translate the non-function pages in the SQL API reference (~12 files).

Files

• `docs/api/sql/Overview.md`
• `docs/api/sql/Optimizer.md`
• `docs/api/sql/CRS-Transformation.md`
• `docs/api/sql/Spider.md`
• `docs/api/sql/NearestNeighbourSearching.md`
• `docs/api/sql/DataFrameAPI.md`
• `docs/api/sql/Parameter.md`
• `docs/api/sql/Reading-legacy-parquet.md`
• `docs/api/sql/Visualization-SedonaPyDeck.md`
• `docs/api/sql/Visualization-SedonaKepler.md`
• `docs/api/sql/Raster-map-algebra.md`
• `docs/api/sql/Raster-affine-transformation.md`
• `docs/api/sql/AggregateFunction.md`, `Constructor.md`, `Function.md`, `Predicate.md` (if present)

Deliverable

A `*.zh.md` sibling for each English page. Function names and SQL keywords stay in English; descriptive prose is translated.