修复: 消息溯源P2切读确认完成 + 走查报告高优项

- P2 切读方案文档更新(确认批次B已上线)
- query LIKE 通配符转义(project/idea/task/knowledge 4 repo)
- dag.rs deep_merge null 覆盖全局配置
- dag.rs 通配 match 展开显式变体
- INDEX.md 补漏 10 个文档索引
- ARCHITECTURE.md 删除与新文档逐字重复
- coordinator.rs 加 #[deprecated] 编译守卫
- AiChat.vue 空值传播加 console.warn

crates/df-storage/src/crud/project_repo.rs

@@ -242,8 +242,9 @@ impl ProjectRepo {
             if let Some(kw) = &q.keyword {
                 let trimmed = kw.trim();
                 if !trimmed.is_empty() {
-                    sql.push_str(" AND (name LIKE ? OR description LIKE ?)");
-                    let pattern = format!("%{trimmed}%");
+                    let escaped = trimmed.replace('%', "\\%").replace('_', "\\_");
+                    sql.push_str(" AND (name LIKE ? OR description LIKE ?) ESCAPE '\\'");
+                    let pattern = format!("%{escaped}%");
                     params_vec.push(Box::new(pattern.clone()));
                     params_vec.push(Box::new(pattern));
                 }