fix(uwsgi): add cache headers, redirects, et al., from olympia.ini

[e9e4e5f0faef]

Summary

• Port remaining uWSGI file-serving settings from the Ansible config (olympia.ini)
• Adds cache headers, HTTP-to-HTTPS redirect, Firefox/Android redirect, attachment headers, and sendfile support

Changes

File	Change
docker/docker-entrypoint.sh	Add static-safe, static-expires, route-if, route-uri, collect-header, and response-route directives to start_web()

Why

PR #372 fixed the immediate static file 404s with --static-map. This PR carries over the remaining uWSGI settings from thundernest-ansible/addons/olympia.ini that affect performance and behaviour:

• static-expires: 90-day cache headers (addresses reported slowness)
• static-safe: allows serving user-media uploads and add-on files
• route-if: HTTP-to-HTTPS redirect
• route-uri: redirects Firefox/Android paths to addons.mozilla.org
• route-uri: content-disposition header for attachment downloads
• collect-header and response-route-if-not: X-Accel-Redirect sendfile for efficient large file serving

Reference: thundernest-ansible/addons/olympia.ini lines 55-67

Safety

No impact on running services until the new image is deployed. All settings are read-only file serving behaviour.

Follow-up

EFS mount targets (separate PR) will provide the actual persistent storage behind the user-media and files paths.