fix(customParseFormat): correct meridiem parsing for non-English locales

[sukvvon]

Description

customParseFormat's meridiemMatch misread PM strings as AM for locales that define a meridiem function (e.g. ko 오전/오후), causing strict-mode parsing to fail.

The loop iterated 1..24 and decided AM/PM with i > 12. Because dayjs uses a 12-hour clock, the PM string first matched at i = 12, where 12 > 12 is false, so it was treated as AM and strict parsing returned Invalid Date.

This changes the loop to iterate 0..23 and decide with i >= 12. The indexOf match is kept intact: with CJK formats such as YYYY年M月D日A... the literal separators bleed into the A token (the parser receives "年月日晚上"), so the partial match is required and the existing zh-cn behavior is preserved.

Fixes #2031

Before

dayjs('2024-01-01 01:00 오후', 'YYYY-MM-DD hh:mm A', 'ko', true).isValid()
// => false (should be 13:00)

After

dayjs('2024-01-01 01:00 오후', 'YYYY-MM-DD hh:mm A', 'ko', true).hour()
// => 13

Tests

Added strict-mode ko meridiem cases (AM, PM, noon, midnight, 11 PM) in test/plugin/customParseFormat.test.js. Full suite passes (778 tests), including existing zh-cn AM/PM cases.