feat(prism): support line_number: 'inline' for per-block line number …

[dwatow]

功能： 支援 line_number: 'inline' 模式，透過 ```lang= 語法按 block 控制行號顯示

修改檔案：

• lib/plugins/highlight/prism.ts：line_number === 'inline' 時全域 fallback 改為 false，並支援 firstLineNumber 對應 firstLine
• lib/plugins/filter/before_post_render/backtick_code_block.ts：偵測 = 語法且 inline mode 時設 options.line_number = true
• test/scripts/filters/backtick_code_block.ts：新增三個測試 case

行為：

語法	結果
```js	不顯示行號
```js=	顯示行號，從第 1 行
```js=5	顯示行號，從第 5 行

[github-actions]

How to test

git clone -b prism-inline-line-number https://github.com/dwatow/hexo.git
cd hexo
npm install
npm test

[coveralls]

Coverage Report for CI Build 25717485167

Coverage remained the same at 99.501%

Details

• Coverage remained the same as the base build.
• Patch coverage: 6 of 6 lines across 2 files are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	10022
Covered Lines:	9972
Line Coverage:	99.5%
Relevant Branches:	2542
Covered Branches:	2444
Branch Coverage:	96.14%
Branches in Coverage %:	No
Coverage Strength:	59.41 hits per line

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