switch API host from minimaxi.com to minimax.io

Point the plugin at the US-based MiniMax service (api.minimax.io and
platform.minimax.io) instead of the China endpoints.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

provider/minimax.yaml

@@ -21,7 +21,7 @@ credentials_for_provider:
     help:
       en_US: Get your Api Key from MiniMax
       zh_Hans: 从 MiniMax 获取您的 Api Key
-    url: https://platform.minimaxi.com/user-center/basic-information/interface-key
+    url: https://platform.minimax.io/user-center/basic-information/interface-key
   group_id:
     type: secret-input
     required: true
@@ -34,7 +34,7 @@ credentials_for_provider:
     help:
       en_US: Get your Group ID from MiniMax
       zh_Hans: 从 MiniMax 获取您的 Group ID
-    url: https://platform.minimaxi.com/user-center/basic-information
+    url: https://platform.minimax.io/user-center/basic-information
 tools:
   - tools/image_generation.yaml
   - tools/music_generation.yaml

tools/base.py

@@ -1,6 +1,6 @@
 import requests
 
-API_ENDPOINT = "https://api.minimaxi.com/v1"
+API_ENDPOINT = "https://api.minimax.io/v1"
 
 
 class MiniMaxBaseTool: