fix: handle non-ASCII OG endpoint paths

[Dawn6666666]

变更内容

修复中文等非 ASCII slug 下 OG 图片 endpoint 在 Astro 7 静态构建时可能触发 NoMatchingStaticPathFound 的问题。

具体改动：

• 将 src/pages/og/[...slug].png.ts 改为 src/pages/og/[...slug].ts
• 在 getStaticPaths() 中把 .png 后缀合入 catch-all slug 参数

原因

原文件名 [...slug].png.ts 会让 Astro 生成严格匹配 .png 结尾的 endpoint route pattern。若静态构建阶段在 trailingSlash: "always" 下把非 ASCII 图片链接规范化为 .png/，该 route pattern 无法匹配尾斜杠路径，导致 params 提取失败并触发 NoMatchingStaticPathFound。

把 .png 移入 catch-all 参数后，endpoint 可以匹配 /og/中文路径.png/，最终静态产物仍会正确写为 .png 文件。

Fixes #500

验证

pnpm install --frozen-lockfile
pnpm exec astro build
pnpm exec astro check

结果：构建通过，Astro check 为 0 errors / 0 warnings / 0 hints。

[Copilot]

Pull request overview

This PR fixes Astro static builds failing to prerender OG image endpoints when the post slug contains non-ASCII characters (e.g., Chinese) and trailingSlash: "always" causes the crawler to normalize /og/<slug>.png into /og/<slug>.png/, which previously did not match the strict ...\.png$ route pattern.

Changes:

• Switches the OG endpoint route from a strict [...,slug].png pattern to a catch-all [...,slug] pattern.
• Updates getStaticPaths() to include .png inside the generated catch-all slug param so the endpoint can match /og/<slug>.png/ while still emitting .png output files.

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