feat(admin): deleted-account dossier + operator delete-user action

The user-detail console gains a Deletion & retention panel: last login (time + IP),
the tombstone (deleted-at + retained real name), and the retention journal (the legal
dossier of detached credentials). A Delete-user action runs the same deletion
orchestration as the in-app flow (mirrors the email-erase pattern). Store readers
RetainedIdentities + DeletionInfo back the view; integration test covers them.

backend/internal/adminconsole/views.go

@@ -151,6 +151,15 @@ type UserDetailView struct {
 	// MergedInto is the primary account id when this account has been retired by a
 	// merge, or empty for a live account.
 	MergedInto string
+	// The account-deletion dossier. Deleted marks a tombstoned account; DeletedAt and
+	// DeletedName are its deletion time and retained real name; LastLoginAt/IP are the
+	// last cold-load stamp (shown for any account); Retained is the credential journal.
+	Deleted     bool
+	DeletedAt   string
+	DeletedName string
+	LastLoginAt string
+	LastLoginIP string
+	Retained    []RetainedRow
 	// FlaggedHighRateAt is the pre-formatted soft high-rate marker timestamp,
 	// empty for an unflagged account; the card shows it with the Clear action.
 	FlaggedHighRateAt string
@@ -237,6 +246,17 @@ type IdentityRow struct {
 	CreatedAt  string
 }
 
+// RetainedRow is one credential in the account-deletion retention journal (the legal
+// dossier of detached credentials): what was detached, when, and why.
+type RetainedRow struct {
+	Kind       string
+	ExternalID string
+	Reason     string
+	Confirmed  bool
+	LinkedAt   string
+	DetachedAt string
+}
+
 // GameRow is one game row in a list.
 type GameRow struct {
 	ID        string