[doc](lance) document string predicate pushdown

[Jay-ju]

Documents the string and Boolean predicate pushdown support added by apache/doris#67051.

What Changed

• Added direct Boolean predicates, LIKE / NOT LIKE, starts_with, and ends_with to the supported predicate table.
• Documented the direct-column/literal requirements and the safety fallbacks for escaped or NUL-bearing patterns and same-named UDFs.
• Updated the EXPLAIN example to show the new predicate forms.
• Kept the English and Chinese 4.x pages synchronized.

docs/ (dev) is intentionally untouched because the Lance Catalog page exists only under 4.x; apache/doris master currently has no Lance integration.

Validation

• git diff --check
• node scripts/docs-governance/report.js --changed --format github (no new blocking findings; existing SEO and missing-current-page warnings remain)

Versions

• dev
• 4.x
• 3.x
• 2.1 or older (not covered by version/language sync gate)

Languages

• Chinese
• English

Docs Checklist

• Checked by AI
• Test Cases Built
• Updated required version and language counterparts, or explained why not
• If only one language changed, confirmed whether source/translation counterparts need sync

[Jay-ju]

@zhangstar333 The predicate-pushdown documentation requested in apache/doris#67051 is included here for both English and Chinese 4.x docs. Please review when convenient.