Feature: #108826 - Add Short URL module

Description

A new backend module Link Management > Short URLs has been introduced. It enables editors to create and manage short URLs that redirect visitors to a configurable target. Short URLs are stored as sys_redirect records with a dedicated record type short_url, providing a streamlined editing form that hides redirect-specific fields that are irrelevant to short URL use cases.

Creating short URLs

Short URLs can be created in two ways:

Manual entry: Editors type a custom path (for example, /promo) into the source path field.
Auto-generation: Clicking the Generate Short URL button generates a random 8-character path (for example, /aBcDeFgH). The path is guaranteed to be unique due to server-side collision checking.

Uniqueness enforcement

Short URL paths must be unique to each source host. Duplicate detection happens at two levels:

Client-side validation: While editing, the source path and source host fields are validated against existing records. If a conflict is detected, both fields are highlighted with an error state together with a notification.
Server-side enforcement: On save, the DataHandler rejects duplicate short URLs and displays a flash message, ensuring data integrity even if client-side validation is bypassed.

Immutability

Once a short URL record has been saved, the source path and source host fields become read-only. This ensures that published short URLs remain stable and previously shared links continue to work. The redirect target can be changed at any time.

Clipboard support

The full short URL, including protocol and host, can be copied to the clipboard from both the list overview and the record editing form.

Impact

Editors benefit from a dedicated interface for managing short URLs without needing to understand redirect configuration details. The module provides a central location for creating, reviewing, and maintaining short URLs with built-in safeguards against duplicates and accidental modifications.