feat(tickets): make ticket title/content/reply length limits configurable

Add ticket_title_max / ticket_content_max / ticket_reply_max to the
users/ticket schema (PHP + SPA) with clamped TicketSettings readers.
All write paths (front REST, admin REST, note REST, native admin page)
and front-end maxlength/counters now read the configured limits.
Remove the hardcoded TICKET_CONTENT_MAX constant.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/Core/ScriptsPart1c.php

@@ -498,10 +498,10 @@ trait ScriptsPart1c {
                     'desc'       => (string) ($report['desc'] ?? ''),
                 ];
             })(),
-            // 工单配置（ticket-center.js）：附件开关与上限、提交公告、催单冷却。
+            // 工单配置（ticket-center.js）：附件开关与上限、提交公告、催单冷却、字数上限。
             'ticket'                => (function () {
                 if (!class_exists('\AKSRT\Ticket\TicketSettings')) {
-                    return ['enabled' => false, 'attachmentEnabled' => false, 'attachmentMax' => 5, 'notice' => ['open' => false, 'text' => ''], 'urgeInterval' => 15];
+                    return ['enabled' => false, 'attachmentEnabled' => false, 'attachmentMax' => 5, 'notice' => ['open' => false, 'text' => ''], 'urgeInterval' => 15, 'titleMax' => 200, 'contentMax' => 5000, 'replyMax' => 3000];
                 }
                 return [
                     'enabled'           => \AKSRT\Ticket\TicketSettings::enabled(),
@@ -512,6 +512,9 @@ trait ScriptsPart1c {
                         'text' => \AKSRT\Ticket\TicketSettings::notice_text(),
                     ],
                     'urgeInterval'      => \AKSRT\Ticket\TicketSettings::urge_interval(),
+                    'titleMax'          => \AKSRT\Ticket\TicketSettings::title_max(),
+                    'contentMax'        => \AKSRT\Ticket\TicketSettings::content_max(),
+                    'replyMax'          => \AKSRT\Ticket\TicketSettings::reply_max(),
                 ];
             })(),
             'stickyEnabled'         => class_exists('\AKSRT\Settings\Settings') ? !empty(\AKSRT\Settings\Settings::get_post_list_style_settings()['sticky_s']) : true,