fix(reports): separate readable categories from report content

Store readable category snapshots separately from details and evidence, validate report categories, and preserve context in admin displays and moderation actions. Widen report categories to TEXT and bump the schema to 3.2.0 without legacy data conversion.

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

src/Core/DBMigrator.php

@@ -26,7 +26,7 @@ class DBMigrator {
     // 沟通记录从工单上的 JSON 日志升级为独立的 ticket_reply 行（支持引用回复）。
     // 3.1.0: aksrt_ticket 新增 urge_count / last_urge_time（催单次数与最近催单时间），
     // 催单冷却改由 last_urge_time 判定，不再依赖 transient；催单同时写入 system 类型的 ticket_reply。
-    const SCHEMA_VERSION = '3.1.0';
+    const SCHEMA_VERSION = '3.2.0';
 
     const OPT_KEY = 'aksrt_db_schema_version';
 

src/Core/DBMigratorPart2.php

@@ -269,7 +269,7 @@ trait DBMigratorPart2 {
             target_type VARCHAR(20) NOT NULL,
             target_id BIGINT UNSIGNED NOT NULL,
             reason TEXT NOT NULL,
-            category VARCHAR(40) NOT NULL DEFAULT '',
+            category TEXT NOT NULL,
             status VARCHAR(20) NOT NULL DEFAULT 'pending',
             created_at DATETIME NOT NULL,
             updated_at DATETIME DEFAULT NULL,