Add emote management UI at /manage

Adds a server-side HTML management page and supporting backend for
full CRUD on emotes. The /manage prefix is kept isolated so an auth
middleware can be applied to it later without touching other routes.

- GET /manage — serves the management UI (add, edit, delete, search)
- GET /manage/emotes — admin JSON endpoint with uuid and alias included
- AdminEmoteResponse model for the expanded admin representation
- Client-side search filters by name or alias as you type

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- Management UI at `GET /manage` for adding, editing, and deleting emotes.
+- `GET /manage/emotes` — admin JSON endpoint returning full emote data (uuid,
+  name, alias, url, timestamps) for use by the management UI.
+- `AdminEmoteResponse` model exposing `uuid` and `alias` fields not present in
+  the public `EmoteResponse`.
+- Client-side search on the management page filtering emotes by name or alias.
+
 ## [0.2.4] - 2026-04-11
 
 ### Fixed