feat: Add MiniMax provider support to UI dashboard

- Add MiniMax to provider_create_fields.json with credential fields:
  - api_key (required, password field)
  - api_base (optional, defaults to https://api.minimax.io/v1)
- Add MiniMax to UI provider enum and mappings
- Includes tooltip for International vs China endpoints
- Default model placeholder: minimax/MiniMax-M2

This enables users to configure MiniMax models directly through the
proxy UI dashboard without needing to edit YAML config files.

Fixes #18481

litellm/proxy/public_endpoints/provider_create_fields.json

@@ -1680,6 +1680,34 @@
     ],
     "default_model_placeholder": "gpt-3.5-turbo"
   },
+  {
+    "provider": "MINIMAX",
+    "provider_display_name": "MiniMax",
+    "litellm_provider": "minimax",
+    "credential_fields": [
+      {
+        "key": "api_key",
+        "label": "API Key",
+        "placeholder": "your-minimax-api-key",
+        "tooltip": "MiniMax API Key from https://platform.minimaxi.com/",
+        "required": true,
+        "field_type": "password",
+        "options": null,
+        "default_value": null
+      },
+      {
+        "key": "api_base",
+        "label": "API Base URL",
+        "placeholder": "https://api.minimax.io/v1",
+        "tooltip": "International: https://api.minimax.io/v1, China: https://api.minimaxi.com/v1",
+        "required": false,
+        "field_type": "text",
+        "options": null,
+        "default_value": "https://api.minimax.io/v1"
+      }
+    ],
+    "default_model_placeholder": "minimax/MiniMax-M2"
+  },
   {
     "provider": "MOONSHOT",
     "provider_display_name": "Moonshot",

ui/litellm-dashboard/src/components/provider_info_helpers.tsx

@@ -24,6 +24,7 @@ export enum Providers {
   Hosted_Vllm = "vllm",
   Infinity = "Infinity",
   JinaAI = "Jina AI",
+  MiniMax = "MiniMax",
   MistralAI = "Mistral AI",
   Ollama = "Ollama",
   OpenAI = "OpenAI",
@@ -55,6 +56,7 @@ export const provider_map: Record<string, string> = {
   Google_AI_Studio: "gemini",
   Bedrock: "bedrock",
   Groq: "groq",
+  MiniMax: "minimax",
   MistralAI: "mistral",
   Cohere: "cohere",
   OpenAI_Compatible: "openai",