Rewrite module for 2.x: domain-aware redirects via Redirect module integration

Starting with 2.x, Domain Redirect is completely rewritten with no upgrade path from prior versions (7.x / 8.x).

Old behavior (7.x / 8.x)

Custom redirect entities at paths like /domain-redirect/12345 that redirected users to different destinations depending on the active domain. Configured at its own admin page.

New behavior (2.x)

Integrates with the Redirect module to make standard redirects domain-aware. The same source path can redirect to different destinations depending on the active domain.

Features:

• Adds a Domain entity reference field to the redirect entity — scope a redirect to a specific domain or leave it global.
• Domain-specific redirects take precedence over global ones.
• Domain column and exposed filter in the redirect admin list.
• Domain-aware unique hash validation — the same source path can have different redirects on different domains.

Dependencies: domain:domain (3.x) and redirect:redirect (1.x).