refactor: reorganize Helm chart structure and update service configurations

deployment/helm/datamate/charts/database/templates/configmap.yaml

@@ -0,0 +1,22 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: datamate-mysql-utf8-config
+data:
+  utf8.cnf: |
+    [mysqld]
+    # 设置服务器默认字符集为 utf8mb4 (推荐，支持完整的 UTF-8，包括 emoji)
+    character-set-server = utf8mb4
+    # 设置默认排序规则
+    collation-server = utf8mb4_unicode_ci
+    # 或者使用 utf8_general_ci (性能稍好，但排序规则稍宽松)
+    default-time-zone = 'Asia/Shanghai'
+    log_error=/var/log/datamate/database/error.log
+
+    [client]
+    # 设置客户端连接默认字符集
+    default-character-set = utf8mb4
+
+    [mysql]
+    # 设置 mysql 命令行客户端默认字符集
+    default-character-set = utf8mb4