fix(ticket): flatten TicketRepository traits to PSR-4-visible paths

TicketRepository fatalled on /user/tickets/ with "Trait AKSRT\Ticket\TicketQuery
not found". src/ classes load only via Composer PSR-4 (AKSRT\ => src/) — there is
no bootstrap require list for them — so the autoloader resolved the traits by
namespace to src/Ticket/TicketQuery.php and src/Ticket/TicketStatus.php. Both
files actually sat in src/Ticket/TicketRepository-traits/, one level deeper, and
were therefore invisible: PHP hit the `use` statement with no trait declared and
died the moment the repository compiled.

The nested directory name imitated the old inc/classes/**/*-traits/ layout, which
only worked because inc/bootstrap.php carried an explicit require_once for every
one of those files. No such mechanism exists under src/. Move both traits up to
sit flat as siblings of the class that uses them — the same shape as
GlobalControllerPart1, ModerationPart1 and the rest of src/. No code changes
inside the traits; their namespace was already correct.

Add tools/audit-psr4-paths.php, which checks every symbol under src/ against the
path Composer maps it to and exits 1 on mismatch. It flags this exact layout, so
the nesting cannot come back unnoticed. Document it in CLAUDE.md next to the
existing admin-contract audit.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Ticket/TicketRepository.php

@@ -133,6 +133,8 @@ final class TicketRepository {
 
     /* ------------------------------------------------------------------ *
      * 状态机（对外入口，内部规则在 TicketStatus trait）
+     *
+     * Trait 必须与宿主类同级平铺：PSR-4 按命名空间寻址，不解析子目录。
      * ------------------------------------------------------------------ */
 
     /**