feat(plugin): 集成过滤查询/排序/搜索到 REST API，添加数据校验和 searchable 索引

- data_dto: PluginDataListParams 新增 filter/sort_by/sort_order
- data_service: list 方法支持 filter/search/sort 参数，自动提取 searchable 字段
- data_service: create/update 添加 required 字段校验
- data_service: 新增 resolve_entity_fields 和 validate_data 辅助函数
- data_handler: 权限检查从硬编码改为动态计算 plugin_id.entity.action
- dynamic_table: searchable 字段自动创建 B-tree 索引

crates/erp-plugin/src/dynamic_table.rs

@@ -93,6 +93,24 @@ impl DynamicTableManager {
             }
         }
 
+        // 为 searchable 字段创建 B-tree 索引以加速 ILIKE 前缀查询
+        for field in &entity.fields {
+            if field.searchable == Some(true) {
+                let sanitized_field = sanitize_identifier(&field.name);
+                let idx_name = format!("{}_{}_sidx", sanitize_identifier(&table_name), sanitized_field);
+                let idx_sql = format!(
+                    "CREATE INDEX IF NOT EXISTS \"{}\" ON \"{}\" (\"data\"->>'{}') WHERE \"deleted_at\" IS NULL",
+                    idx_name, table_name, sanitized_field
+                );
+                db.execute(Statement::from_string(
+                    sea_orm::DatabaseBackend::Postgres,
+                    idx_sql,
+                ))
+                .await
+                .map_err(|e| PluginError::DatabaseError(e.to_string()))?;
+            }
+        }
+
         tracing::info!(table = %table_name, "Dynamic table created");
         Ok(())
     }