perf(query): 全面治理后台跨表模糊查询慢SQL并升级SQL门禁守护

- 解决 MySQL 8.4 无法跨表 Index Merge 导致的索引失效与全表扫描问题
- 订单/提号/纠纷/用户/商品/会话列表实现智能意图路由分流直达单表唯一索引
- 剥离 COUNT(*) 阶段无关多表关联及标量子查询，实现首页条数快速短路
- check-sql-guard.sh 增加 forbid_pattern 拦截器与核心路由强校验防线

scripts/check-sql-guard.sh

@@ -15,6 +15,13 @@ require_pattern() {
   fi
 }
 
+forbid_pattern() {
+  local file="$1" pattern="$2" name="$3"
+  if [[ -f "${ROOT_DIR}/${file}" ]] && grep -Fq -- "${pattern}" "${ROOT_DIR}/${file}"; then
+    failures+=("${name}: 存在被禁止的跨表全扫描反模式 ${pattern} (${file})")
+  fi
+}
+
 # 数据库运行时配置和参数脱敏不能被重构删除。
 require_pattern "backend/internal/config/config.go" "DATABASE_SLOW_QUERY_THRESHOLD_MS" "慢查询阈值配置"
 require_pattern "backend/internal/config/config.go" "DATABASE_MAX_OPEN_CONNS" "连接池上限配置"
@@ -31,6 +38,31 @@ require_pattern "backend/migrations/000060_finance_dashboard_indexes.sql" "idx_a
 require_pattern "backend/internal/modules/listing/public_query.go" "if pageSize > 50" "公开商品分页上限"
 require_pattern "backend/internal/modules/pickup/repository.go" "if pageSize > 100" "后台接单分页上限"
 
+# 智能意图路由与单表唯一索引直达防线（防止多表跨表 OR/LIKE 导致 MySQL 放弃索引而退化为全表扫描）
+require_pattern "backend/internal/modules/order/queries.go" "o.order_no = ?" "订单列表订单号唯一索引直达"
+require_pattern "backend/internal/modules/order/queries.go" "l.listing_no = ?" "订单列表商品号唯一索引直达"
+require_pattern "backend/internal/modules/order/queries.go" "owner.phone = ? OR renter.phone = ?" "订单列表手机号索引直达"
+require_pattern "backend/internal/modules/order/queries.go" "page == 1 && len(rows) < pageSize" "订单列表首页面单扫描短路"
+
+require_pattern "backend/internal/modules/pickup/repository.go" "p.pickup_no = ?" "提号列表提号单号唯一索引直达"
+require_pattern "backend/internal/modules/pickup/repository.go" "owner.phone = ?" "提号列表号主手机号索引直达"
+require_pattern "backend/internal/modules/pickup/repository.go" "page == 1 && len(rows) < pageSize" "提号列表首页面单扫描短路"
+
+require_pattern "backend/internal/modules/dispute/query.go" "o.order_no = ?" "纠纷列表订单号唯一索引直达"
+require_pattern "backend/internal/modules/dispute/query.go" "page == 1 && len(rows) < pageSize" "纠纷列表首页面单扫描短路"
+
+require_pattern "backend/internal/modules/adminuser/repository.go" "u.phone = ?" "用户管理手机号唯一索引直达"
+require_pattern "backend/internal/modules/adminuser/repository.go" "page == 1 && len(rows) < pageSize" "用户管理首页面单扫描短路"
+
+require_pattern "backend/internal/modules/listing/query.go" "l.listing_no = ?" "商品列表商品号唯一索引直达"
+require_pattern "backend/internal/modules/listing/query.go" "page == 1 && len(rows) < pageSize" "商品列表首页面单扫描短路"
+
+require_pattern "backend/internal/modules/chat/support.go" "l.listing_no = ?" "客服会话商品号唯一索引直达"
+require_pattern "backend/internal/modules/chat/support.go" "renter.phone = ? OR owner.phone = ?" "客服会话手机号唯一索引直达"
+
+# 禁止核心列表重新引入跨表 6~10 路全扫描反模式
+forbid_pattern "backend/internal/modules/dispute/query.go" "o.order_no LIKE ? OR l.listing_no LIKE ? OR a.title LIKE ? OR owner.phone LIKE ? OR renter.phone LIKE ? OR d.id = ?" "纠纷列表禁止6表无意图全表扫描"
+
 # 已发布迁移只允许新增，不允许修改或删除历史文件。
 if changed_migrations="$(git -C "${ROOT_DIR}" diff --name-status HEAD -- backend/migrations)"; then
   while read -r status file _; do