去重总数据国家限定五国并优化筛选布局

- 国家仅保留德国/英国/法国/意大利/西班牙，移除美国及US映射
- 保留服务器已有 V90 迁移，新增 V91 添加 country 列及索引
- ASIN列表筛选区改为两行布局：查询条件+按钮在上，日期+导出在下

backend-java/src/main/resources/db/V90__add_variant_collection_app_menu.sql

@@ -0,0 +1,17 @@
+-- Register the existing legacy static page in the APP permission menu.
+-- The route_path is the menu slug; the page URL is /web_source/variant-collection.html.
+INSERT INTO `columns` (`name`, `column_key`, `menu_type`, `route_path`, `sort_order`, `parent_id`)
+SELECT 'ASIN变体采集', 'variant-collection', 'app', 'variant-collection', 118,
+       (SELECT id FROM `columns` WHERE `column_key` = 'brand_front_tools' LIMIT 1)
+WHERE NOT EXISTS (
+    SELECT 1 FROM `columns` WHERE `column_key` = 'variant-collection'
+);
+
+UPDATE `columns` AS child
+JOIN `columns` AS parent ON parent.`column_key` = 'brand_front_tools'
+SET child.`name` = 'ASIN变体采集',
+    child.`menu_type` = 'app',
+    child.`route_path` = 'variant-collection',
+    child.`sort_order` = 118,
+    child.`parent_id` = parent.`id`
+WHERE child.`column_key` = 'variant-collection';

backend-java/src/main/resources/db/V91__dedupe_total_data_country.sql

@@ -0,0 +1,33 @@
+SET @country_col_exists := (
+    SELECT COUNT(*)
+    FROM information_schema.COLUMNS
+    WHERE TABLE_SCHEMA = DATABASE()
+      AND TABLE_NAME = 'biz_dedupe_total_data'
+      AND COLUMN_NAME = 'country'
+);
+
+SET @sql_add_country := IF(
+    @country_col_exists = 0,
+    'ALTER TABLE biz_dedupe_total_data ADD COLUMN country VARCHAR(64) DEFAULT NULL COMMENT ''国家代码，逗号分隔，如 DE,UK'' AFTER data_value',
+    'SELECT 1'
+);
+PREPARE stmt_add_country FROM @sql_add_country;
+EXECUTE stmt_add_country;
+DEALLOCATE PREPARE stmt_add_country;
+
+SET @country_idx_exists := (
+    SELECT COUNT(*)
+    FROM information_schema.STATISTICS
+    WHERE TABLE_SCHEMA = DATABASE()
+      AND TABLE_NAME = 'biz_dedupe_total_data'
+      AND INDEX_NAME = 'idx_country'
+);
+
+SET @sql_add_country_idx := IF(
+    @country_idx_exists = 0,
+    'ALTER TABLE biz_dedupe_total_data ADD INDEX idx_country (country)',
+    'SELECT 1'
+);
+PREPARE stmt_add_country_idx FROM @sql_add_country_idx;
+EXECUTE stmt_add_country_idx;
+DEALLOCATE PREPARE stmt_add_country_idx;