feat: upgrade MiniMax default model to M3 (#857)

- Add MiniMax-M3 to the model selection list (set as new default at top)
- Retain MiniMax-M2.7 and MiniMax-M2.7-highspeed
- Remove deprecated MiniMax-M2.5 / M2.5-highspeed
- Update supportsImageInput: M3 supports image input (M2.x stay text-only)
- Update unit tests to reflect new model lineup
- Update example AI_MODEL in CN/EN/JA docs to MiniMax-M3

Co-authored-by: octo-patch <octo-patch@github.com>

docs/cn/ai-providers.md

@@ -222,7 +222,7 @@ MiniMax 支持两种 API 格式：
 
 ```bash
 MINIMAX_API_KEY=your_api_key
-AI_MODEL=MiniMax-M2.7
+AI_MODEL=MiniMax-M3
 ```
 
 可选配置：

docs/en/ai-providers.md

@@ -237,7 +237,7 @@ MiniMax supports two API formats:
 
 ```bash
 MINIMAX_API_KEY=your_api_key
-AI_MODEL=MiniMax-M2.7
+AI_MODEL=MiniMax-M3
 ```
 
 Optional configuration:

docs/ja/ai-providers.md

@@ -222,7 +222,7 @@ MiniMax は 2 つの API 形式をサポートしています：
 
 ```bash
 MINIMAX_API_KEY=your_api_key
-AI_MODEL=MiniMax-M2.7
+AI_MODEL=MiniMax-M3
 ```
 
 オプション設定：

lib/ai-providers.ts

@@ -1390,8 +1390,12 @@ export function supportsImageInput(modelId: string): boolean {
         return false
     }
 
-    // MiniMax text models (MiniMax-M2.x series are text-only)
-    if (lowerModelId.includes("minimax") && !hasVisionIndicator) {
+    // MiniMax text models (MiniMax-M2.x series are text-only; M3 supports image input)
+    if (
+        lowerModelId.includes("minimax") &&
+        !hasVisionIndicator &&
+        !lowerModelId.includes("m3")
+    ) {
         return false
     }
 

lib/types/model-config.ts

@@ -351,10 +351,9 @@ export const SUGGESTED_MODELS: Partial<Record<ProviderName, string[]>> = {
     ],
     minimax: [
         // MiniMax models (Anthropic-compatible API)
+        "MiniMax-M3",
         "MiniMax-M2.7",
         "MiniMax-M2.7-highspeed",
-        "MiniMax-M2.5",
-        "MiniMax-M2.5-highspeed",
     ],
     novita: [
         // Novita AI models (OpenAI-compatible API)

tests/unit/ai-providers.test.ts

@@ -180,11 +180,14 @@ describe("supportsImageInput", () => {
         expect(supportsImageInput("moonshot-v1-128k")).toBe(false)
     })
 
-    it("returns false for MiniMax text models", () => {
+    it("returns false for MiniMax M2 text models", () => {
         expect(supportsImageInput("MiniMax-M2.7")).toBe(false)
-        expect(supportsImageInput("MiniMax-M2.5")).toBe(false)
+        expect(supportsImageInput("MiniMax-M2.7-highspeed")).toBe(false)
         expect(supportsImageInput("MiniMax-M2")).toBe(false)
-        expect(supportsImageInput("MiniMax-M2.5-highspeed")).toBe(false)
+    })
+
+    it("returns true for MiniMax M3 (supports image input)", () => {
+        expect(supportsImageInput("MiniMax-M3")).toBe(true)
     })
 
     it("returns false for DeepSeek text models", () => {