[GH-2867] Translate SQL API Raster functions to Chinese (Phase 9)

[jiayuasu]

Part of #2867.

Scope

Translate the SQL API Raster function reference pages (~290 files).

Files

• `docs/api/sql/Raster-Functions.md`
• `docs/api/sql/Raster-Operators/**.md` (per-function reference pages: `RS_*`)

Deliverable

A `*.zh.md` sibling for each English page, following the conventions established in Phase 8 for section headings (Description / Format / Parameters / Example / Output).

Notes

• This is the largest section. Reviewer-friendly to split further by alphabetical range (A-F, G-P, Q-Z) if needed — coordinate in this issue before opening multiple PRs.