Feature request: support configurable templates for HTML directory listing

[SilviaSWR]

Feature request: support custom footer in HTML directory listing

Summary

Introduce support for fully configurable HTML templates for the directory listing page, replacing the current hardcoded HTML generation.

Motivation

The current implementation tightly couples the HTML structure with the server logic, making it difficult to customize the UI (branding, layout, acknowledgments, styling) without modifying the codebase.

A template-based approach would allow deployments to fully customize the directory listing presentation while keeping core WebDAV logic unchanged.

In particular, this would also enable:

• the use of custom CSS stylesheets
• inclusion of images and logos
• full branding customization of the directory browser UI

Proposed behavior

• Allow configuration of a template file for the directory browser (e.g. dir_browser.html)
• The template should define the full HTML structure of the directory listing page
• The system should provide the context variables to the template.

Notes

This feature should not affect:

• static file serving
• authentication
• provider logic