OF-3244: Add DNS overrides page to the admin console
Introduce a new admin console page for managing DNS override rules used during XMPP domain resolution.
The page allows administrators to:
- view configured overrides
- add or update exact, wildcard, and global fallback entries
- remove existing overrides
This also adds the admin console navigation entry and (AI-generated) localized UI strings.
OF-3450: Support recursive DNS override re-lookup with loop and depth protection
Support recursive DNS override resolution by re-querying resolved override targets until a terminal hostname is reached. This improves override chaining for aliases and proxy targets while preserving existing precedence rules (exact, wildcard, global fallback).
Add loop detection and maximum recursion depth safeguards to prevent infinite resolution chains.
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