feat(DDS): import DDS resource, unit test and document.

docs/data-sources/dds_instances.md

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+---
+subcategory: "Document Database Service (DDS)"
+---
+
+# flexibleengine_dds_instances
+
+Use this data source to get the list of DDS instances.
+
+## Example Usage
+
+```hcl
+variable "vpc_id" {}
+variable "subnet_id" {}
+
+data "flexibleengine_dds_instances" "test" {
+  name      = "test_name"
+  mode      = "Sharding"
+  vpc_id    = var.vpc_id
+  subnet_id = var.subnet_id
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `region` - (Optional, String) Specifies the region in which to query the data source. If omitted, the provider-level
+  region will be used.
+
+* `name` - (Optional, String) Specifies the DB instance name.
+
+* `mode` - (Optional, String) Specifies the mode of the database instance.
+
+* `vpc_id` - (Optional, String) Specifies the VPC ID.
+
+* `subnet_id` - (Optional, String) Specifies the subnet Network ID.
+
+## Attribute Reference
+
+In addition to all arguments above, the following attributes are exported:
+
+* `id` - The resource ID.
+
+* `instances` - Indicates the list of DDS instances.
+  The [instances](#dds_instances) object structure is documented below.
+
+<a name="dds_instances"></a>
+The `instances` block supports:
+
+* `id` - Indicates the ID of the instance.
+
+* `name` - Indicates the DB instance name.
+
+* `ssl` - Indicates whether to enable or disable SSL.
+
+* `port` - Indicates the database port number. The port range is 2100 to 9500.
+
+* `datastore` - Indicates database information.
+  The [datastore](#dds_datastore) object structure is documented below.
+
+* `backup_strategy` - Indicates backup strategy.
+  The [backup_strategy](#dds_backup_strategy) object structure is documented below.
+
+* `vpc_id` - Indicates the VPC ID.
+
+* `subnet_id` - Indicates the subnet Network ID.
+
+* `security_group_id` - Indicates the security group ID of the DDS instance.
+
+* `disk_encryption_id` - Indicates the disk encryption ID of the instance.
+
+* `mode` - Specifies the mode of the database instance.
+
+* `db_username` - Indicates the DB Administrator name.
+
+* `status` - Indicates the DB instance status.
+
+* `enterprise_project_id` - Indicates the enterprise project id of the dds instance.
+
+* `nodes` - Indicates the instance nodes information.
+  The [nodes](#dds_nodes) object structure is documented below.
+
+* `tags` - Indicates the key/value pairs to associate with the DDS instance.
+
+<a name="dds_datastore"></a>
+The `datastore` block supports:
+
+* `type` - Indicates the DB engine.
+
+* `version` - Indicates the DB instance version.
+
+* `storage_engine` - Indicates the storage engine of the DB instance.
+
+<a name="dds_backup_strategy"></a>
+The `backup_strategy` block supports:
+
+* `start_time` - Indicates the backup time window.
+
+* `keep_days` - Indicates the number of days to retain the generated backup files.
+
+<a name="dds_nodes"></a>
+The `nodes` block supports:
+
+* `id` - Indicates the node ID.
+
+* `name` - Indicates the node name.
+
+* `role` - Indicates the node role.
+
+* `type` - Indicates the node type.
+
+* `private_ip` - Indicates the private IP address of a node.
+
+* `public_ip` - Indicates the EIP that has been bound on a node.
+
+* `status` - Indicates the node status.

docs/resources/dds_audit_log_policy.md

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+---
+subcategory: "Document Database Service (DDS)"
+---
+
+# flexibleengine_dds_audit_log_policy
+
+Manages a DDS audit log policy resource within FlexibleEngine.
+
+## Example Usage
+
+```hcl
+variable "instance_id" {}
+variable "keep_days" {}
+
+resource "flexibleengine_dds_audit_log_policy" "test"{
+  instance_id = var.instance_id
+  keep_days   = var.keep_days
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `region` - (Optional, String, ForceNew) Specifies the region in which to create the resource.
+  If omitted, the provider-level region will be used. Changing this parameter will create a new resource.
+
+* `instance_id` - (Required, String, ForceNew) Specifies the ID of the DDS instance.
+
+  Changing this parameter will create a new resource.
+
+* `keep_days` - (Required, Int) Specifies the number of days for storing audit logs. The value ranges from 7 to 732.
+
+* `audit_scope` - (Optional, String) Specifies the audit scope.
+  If this parameter is left blank or set to **all**, all audit log policies are enabled.
+  You can enter the database or collection name. Use commas (,) to separate multiple databases
+  or collections. If the name contains a comma (,), add a dollar sign ($) before the comma
+  to distinguish it from the separators. Enter a maximum of 1024 characters. The value
+  cannot contain spaces or the following special characters "[]{}():? The dollar sign ($)
+  can be used only in escape mode.
+
+* `audit_types` - (Optional, List) Specifies the audit type. The value is **auth**, **insert**, **delete**, **update**,
+  **query** or **command**.
+
+* `reserve_auditlogs` - (Optional, String) Specifies whether the historical audit logs are
+  retained when SQL audit is disabled.
+  + **true**: indicates that historical audit logs are retained when SQL audit is disabled.(default value)
+  + **false**: indicates that existing historical audit logs are deleted when SQL audit is disabled.
+
+## Attribute Reference
+
+In addition to all arguments above, the following attributes are exported:
+
+* `id` - The resource ID.
+
+## Import
+
+The DDS audit log policy can be imported using the instance ID, e.g.:
+
+```shell
+terraform import flexibleengine_dds_audit_log_policy.test <instance_id>
+```

docs/resources/dds_backup.md

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+---
+subcategory: "Document Database Service (DDS)"
+---
+
+# flexibleengine_dds_backup
+
+Manages a DDS backup resource within FlexibleEngine.
+
+## Example Usage
+
+```hcl
+variable "dds_instance_id" {}
+variable "name" {}
+
+resource "flexibleengine_dds_backup" "test"{
+  instance_id = var.dds_instance_id
+  name        = var.name
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `region` - (Optional, String, ForceNew) Specifies the region in which to create the resource.
+  If omitted, the provider-level region will be used. Changing this parameter will create a new resource.
+
+* `instance_id` - (Required, String, ForceNew) Specifies the ID of a DDS instance.
+  Changing this parameter will create a new resource.
+
+* `name` - (Required, String, ForceNew) Specifies the manual backup name.
+  The value must be 4 to 64 characters in length and start with a letter (from A to Z or from a to z).
+  It is case-sensitive and can contain only letters, digits (from 0 to 9), hyphens (-), and underscores (_).
+  Changing this parameter will create a new resource.
+
+* `description` - (Optional, String, ForceNew) Specifies the manual backup description.
+  Changing this parameter will create a new resource.
+
+## Attribute Reference
+
+In addition to all arguments above, the following attributes are exported:
+
+* `id` - The resource ID.
+
+* `instance_name` - Indicates the name of a DDS instance.
+
+* `datastore` - Indicates the database version.
+  The [datastore](#dds_datastore) object structure is documented below.
+
+* `type` - Indicates the backup type. Valid value:
+  + **Manual**: indicates manual full backup.
+
+* `begin_time` - Indicates the start time of the backup. The format is yyyy-mm-dd hh:mm:ss. The value is in UTC format.
+
+* `end_time` - Indicates the end time of the backup. The format is yyyy-mm-dd hh:mm:ss. The value is in UTC format.
+
+* `status` - Indicates the backup status. Valid value:
+  + **BUILDING**: Backup in progress.
+  + **COMPLETED**: Backup completed.
+  + **FAILED**: Backup failed.
+  + **DISABLED**: Backup being deleted.
+
+* `size` - Indicates the backup size in KB.
+
+<a name="dds_datastore"></a>
+The `datastore` block supports:
+
+* `type` - Indicates the DB engine.
+
+* `version` - Indicates the database version. The value can be **4.2**, **4.0**, or **3.4**.
+
+## Timeouts
+
+This resource provides the following timeouts configuration options:
+
+* `create` - Default is 30 minutes.
+* `delete` - Default is 10 minutes.
+
+## Import
+
+The DDS backup can be imported using the instance ID and the backup ID separated by a slash, e.g.:
+
+```shell
+terraform import flexibleengine_dds_backup.test 6fb8b99944c7459da32f751f0edea756br02/0ce123456a00f2591fabc00385ff1234
+```

docs/resources/dds_parameter_template.md

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+---
+subcategory: "Document Database Service (DDS)"
+---
+
+# flexibleengine_dds_parameter_template
+
+Manages a DDS parameter template resource within FlexibleEngine.
+
+## Example Usage
+
+```hcl
+variable "name" {}
+variable "parameter_values" {}
+variable "node_type" {}
+variable "node_version" {}
+
+resource "flexibleengine_dds_parameter_template" "test"{
+  name             = var.name
+  parameter_values = var.parameter_values
+  node_type        = var.node_type
+  node_version     = var.node_version
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `region` - (Optional, String, ForceNew) Specifies the region in which to create the resource.
+  If omitted, the provider-level region will be used. Changing this parameter will create a new resource.
+
+* `name` - (Required, String) Specifies the parameter template name.
+  The value must be 1 to 64 characters in length and start with a letter (from A to Z or from a to z).
+  It is case-sensitive and can contain only letters, digits (from 0 to 9), hyphens (-), and underscores (_).
+
+* `node_type` - (Required, String, ForceNew) Specifies the node type of parameter template node_type. Valid value:
+  + **mongos**: the mongos node type.
+  + **shard**: the shard node type.
+  + **config**: the config node type.
+  + **replica**: the replica node type.
+  + **single**: the single node type.
+
+  Changing this parameter will create a new resource.
+
+* `node_version` - (Required, String, ForceNew) Specifies the database version.
+  The value can be **4.2**, **4.0** or **3.4**.
+
+  Changing this parameter will create a new resource.
+
+* `parameter_values` - (Optional, Map) Specifies the mapping between parameter names and parameter values.
+  You can customize parameter values based on the parameters in the default parameter template.
+
+* `description` - (Optional, String) Specifies the parameter template description.
+  The description must consist of a maximum of 256 characters and cannot contain the carriage
+  return character or the following special characters: >!<"&'=.
+
+## Attribute Reference
+
+In addition to all arguments above, the following attributes are exported:
+
+* `id` - The resource ID.
+
+* `parameters` - Indicates the parameters defined by users based on the default parameter templates.
+  The [parameters](#DdsParameterTemplate_Parameter) structure is documented below.
+
+<a name="DdsParameterTemplate_Parameter"></a>
+The `parameters` block supports:
+
+* `name` - Indicates the parameter name.
+
+* `value` - Indicates the parameter value.
+
+* `description` - Indicates the parameter description.
+
+* `type` - Indicates the parameter type. The value can be integer, string, boolean, float, or list.
+
+* `value_range` - Indicates the value range.
+
+* `restart_required` - Indicates whether the instance needs to be restarted.
+  + If the value is **true**, restart is required.
+  + If the value is **false**, restart is not required.
+
+* `readonly` - Indicates whether the parameter is read-only.
+  + If the value is **true**, the parameter is read-only.
+  + If the value is **false**, the parameter is not read-only.
+
+## Import
+
+The DDS parameter template can be imported using the `id`, e.g.
+
+```shell
+terraform import flexibleengine_dds_parameter_template.test <tempalate_id>
+```