Align with AM stack SOPs: required files, nginx hardening, mobile CSS

- Add robots.txt, sitemap.xml (16 pages), 404.html, 500.html per SOP
- nginx: allow robots.txt/sitemap.xml explicitly, fix error_page to 404.html, deny _template.html, remove txt from deny list, fix API proxy comment
- Convert residential.png to residential.webp per image SOP
- components.css: mobile nav breakpoint 768→1023px, 360px ultra-narrow query, overflow-x:clip, inline grid collapse overrides
- blog/index.html: placeholder blog listing page with 3 article cards

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Concept Agent
2026-05-27 18:53:35 +02:00
parent 6917cb6701
commit 88ed4e6bda
8 changed files with 549 additions and 4 deletions
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