hc user delete: ask first, and take -y

It deleted the user and their tokens at once, while every other delete
asks and takes -y/--yes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -106,6 +106,8 @@ All notable changes to Housecarl are documented here. The format follows
 
 ### Changed
 
+- `hc user delete` asks first, as every other delete does, and takes
+  `-y`/`--yes` not to; it deleted the user and their tokens at once.
 - The ruleset's diff (Changes, `hc changeset diff`, `--dry-run`) names
   the chain each part is in on its `@@` line (`@@ -40,6 +40,8 @@ chain
   forward`), as `git diff` names the function, so a rule added deep in a