[GH-2867] Translate SedonaSnow API reference to Chinese (Phase 11)

[jiayuasu]

Part of #2867.

Scope

Translate the SedonaSnow API reference pages (~209 files).

Files

• `docs/api/snowflake/vector-data/Overview.md`
• `docs/api/snowflake/vector-data/Geometry-Functions.md`
• `docs/api/snowflake/**/*.md` (per-function reference pages)

Deliverable

A `*.zh.md` sibling for each English page, following the conventions established in Phase 8 for section headings.

Notes

• May be split further by category if PR size warrants — coordinate in this issue before opening multiple PRs.

[jiayuasu]

Closing as out of scope for the i18n EPIC.

This sub-issue covers a function-by-function SQL/UDF reference area (Geometry/Geography, Flink, or Snowflake) where the source files are dominated by function signatures, parameter tables, return types, and code blocks. The English source is the canonical spec; translating the surrounding prose adds limited value compared to the maintenance overhead of keeping per-function reference pages in sync across two locales.

The overview/concept pages and entry points were translated in #2947. Per-function reference pages remain English-only by design.

If a user or future contributor wants to revisit this, feel free to reopen.