feat(server): 添加服务器地理位置信息字段

为服务器模型添加经度、纬度及中心点坐标字段，并在相关逻辑中处理这些字段
同时修复服务器用户列表缓存功能

initialize/migrate/database/02119_node.up.sql

@@ -0,0 +1,67 @@
+-- Add longitude if not exists
+SET @col_exists := (
+    SELECT COUNT(*)
+    FROM INFORMATION_SCHEMA.COLUMNS
+    WHERE TABLE_SCHEMA = DATABASE()
+      AND TABLE_NAME = 'servers'
+      AND COLUMN_NAME = 'longitude'
+);
+SET @sql := IF(
+    @col_exists = 0,
+    'ALTER TABLE `servers` ADD COLUMN `longitude` VARCHAR(255) DEFAULT '''' COMMENT ''longitude''',
+    'SELECT 1'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- Add latitude if not exists
+SET @col_exists := (
+    SELECT COUNT(*)
+    FROM INFORMATION_SCHEMA.COLUMNS
+    WHERE TABLE_SCHEMA = DATABASE()
+      AND TABLE_NAME = 'servers'
+      AND COLUMN_NAME = 'latitude'
+);
+SET @sql := IF(
+    @col_exists = 0,
+    'ALTER TABLE `servers` ADD COLUMN `latitude` VARCHAR(255) DEFAULT '''' COMMENT ''latitude''',
+    'SELECT 1'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- Add longitude_center if not exists
+SET @col_exists := (
+    SELECT COUNT(*)
+    FROM INFORMATION_SCHEMA.COLUMNS
+    WHERE TABLE_SCHEMA = DATABASE()
+      AND TABLE_NAME = 'servers'
+      AND COLUMN_NAME = 'longitude_center'
+);
+SET @sql := IF(
+    @col_exists = 0,
+    'ALTER TABLE `servers` ADD COLUMN `longitude_center` VARCHAR(255) DEFAULT '''' COMMENT ''longitude center''',
+    'SELECT 1'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- Add latitude_center if not exists
+SET @col_exists := (
+    SELECT COUNT(*)
+    FROM INFORMATION_SCHEMA.COLUMNS
+    WHERE TABLE_SCHEMA = DATABASE()
+      AND TABLE_NAME = 'servers'
+      AND COLUMN_NAME = 'latitude_center'
+);
+SET @sql := IF(
+    @col_exists = 0,
+    'ALTER TABLE `servers` ADD COLUMN `latitude_center` VARCHAR(255) DEFAULT '''' COMMENT ''latitude center''',
+    'SELECT 1'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;