Added a Markdown viewer for logs with injected meta and index links via query file.

Date: 2026-01-09 00:00 Summary: Added a Markdown viewer for logs with injected meta and index links via query file.

[question] 新增 viewer.html 静态渲染 Markdown 并注入对应 meta

[try to solve]

Added public/dev-logs/viewer.html: renders Markdown with Marked; injects title, description, OG/Twitter, and canonical; shows date and summary.
Updated public/dev-logs/index.html so links go to viewer.html?file=<md> for a single viewer path.

[actions]

Added a Markdown viewer for logs with injected meta and index links via query file. | Dev Logs