admin: add delete user with confirmation dialog

internal/db/queries.sql

@@ -7,6 +7,9 @@ SELECT * FROM user WHERE username = ? LIMIT 1;
 -- name: ListUsers :many
 SELECT * FROM user ORDER BY created_at DESC;
 
+-- name: DeleteUser :exec
+DELETE FROM user WHERE id = ?;
+
 -- name: CreateUser :one
 INSERT INTO user (id, username, password_hash)
 VALUES (?, ?, ?)

internal/server/routes.go

@@ -111,6 +111,8 @@ func NewRouter(cfg Config) http.Handler {
 	mux.Handle("/admin/users/", middleware.RequireAdmin(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		path := r.URL.Path
 		switch {
+		case strings.HasSuffix(path, "/delete"):
+			adminHandler.HandleDeleteUser(w, r)
 		case strings.HasSuffix(path, "/watchlist"):
 			adminHandler.HandleUserWatchlist(w, r)
 		case strings.HasSuffix(path, "/continue-watching"):