[clue]

This changeset adds a Cache-Control header so all files are cached for 1 day. Previously the origin sent no caching headers at all, so this was left to whatever sits in front of it: Bunny CDN currently answers with anything between 1 day and 30 days depending on the file, so a changed page or script can keep serving stale for up to a month.

The 1 day matches what the CDN has been configured with since #145 and what the README has claimed since #93. Sending it from the origin means it applies consistently, survives a CDN change and is covered by the integration tests, which now check it for pages, the feed and static assets alike.

Builds on top of #93, #136 and #147
Refs #145 and https://github.com/clue-engineering/miley/pull/94 (private)

[Copilot]

Copilot review overview

🔵 Needs a closer look

Address caching for redirects/errors and document the mod_headers requirement for non-Docker deployments.

Review effort: Lite
Findings: None

What changed in this PR

Adds a one-day Cache-Control policy for Apache-served pages and static assets.

Changes:

• Adds Cache-Control: max-age=86400.
• Enables Apache mod_headers.
• Extends integration tests.
• Removes outdated README caching documentation.

File	Summary
www/​.htaccess	Adds the cache header. Moderate findings: it excludes redirects/errors and requires documented mod_headers support.
tests/​integration.bash	Verifies caching headers for pages, feeds, and assets.
README.md	Removes obsolete caching documentation.
Dockerfile	Enables Apache mod_headers.

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