Update environment variable docs for OceanBase and seekdb (#669)

* Update environment variable docs for OceanBase and SeekDB

Expanded supported DB_TYPE values to include 'oceanbase' and 'seekdb' in `environments.mdx`. Clarified that OceanBase vector database settings also apply to seekdb, and replaced placeholder/English-only Japanese and Chinese docs with full, auto-translated content including all environment variable explanations.

* Remove ja and zh docs

---------

Co-authored-by: Riskey <riskey47@dify.ai>

en/self-host/configuration/environments.mdx

@@ -127,7 +127,9 @@ The database uses PostgreSQL. Please use the public schema.
   Available values include：
 
   - `postgresql`(default)
-  - `mysql` (MySQL-compatible databases like OceanBase and seekdb can also use this value)
+  - `mysql`
+  - `oceanbase`
+  - `seekdb`
 
 - DB_USERNAME: username
 - DB_PASSWORD: password
@@ -406,27 +408,27 @@ Used to store uploaded data set files, team/tenant encryption keys, and other fi
 
 - OCEANBASE_VECTOR_HOST
 
-  The hostname or IP address of OceanBase vector database.
+  The hostname or IP address of OceanBase or seekdb vector database.
 
 - OCEANBASE_VECTOR_PORT
 
-  The port of OceanBase vector database.
+  The port of OceanBase or seekdb vector database.
 
 - OCEANBASE_VECTOR_USER
 
-  The username of OceanBase vector database.
+  The username of OceanBase or seekdb vector database.
 
 - OCEANBASE_VECTOR_PASSWORD
 
-  The password of OceanBase vector database user.
+  The password of OceanBase or seekdb vector database user.
 
 - OCEANBASE_VECTOR_DATABASE
 
-  The database name of OceanBase vector database.
+  The database name of OceanBase or seekdb vector database.
 
 - OCEANBASE_CLUSTER_NAME
 
-  The cluster name of OceanBase vector database, only available for Docker deployment.
+  The cluster name of OceanBase or seekdb vector database, only available for Docker deployment.
 
 - OCEANBASE_MEMORY_LIMIT
 
@@ -434,7 +436,7 @@ Used to store uploaded data set files, team/tenant encryption keys, and other fi
 
 - SEEKDB_MEMORY_LIMIT
 
-  The memory limit of seekdb, only available for Docker deployment.
+  The memory limit of seekdb vector database, only available for Docker deployment.
 
 - TABLESTORE_ENDPOINT
 

ja/self-host/configuration/environments.mdx

@@ -4,4 +4,4 @@ title: 環境変数
 
 <Note>
 このドキュメントは英語版のみです。[英語ドキュメント](/en/self-host/configuration/environments)を参照してください。
-</Note>
+</Note>

zh/self-host/configuration/environments.mdx

@@ -4,4 +4,4 @@ title: 环境变量
 
 <Note>
 此文档当前仅提供英文版本。请参阅[英文文档](/en/self-host/configuration/environments)。
-</Note>
+</Note>