chore: 接入 AI Gateway 并切换轻量代理至 MiniMax M2.5

opencode.jsonc

@@ -3,13 +3,13 @@
   "plugin": ["oh-my-opencode@latest"],
   "autoupdate": false,
   "model": "openai/gpt-5.4",
-  "small_model": "openai/gpt-5.4-mini",
+  "small_model": "ai-gateway/minimax-m2.5",
   "provider": {
     "openai": {
       "npm": "@ai-sdk/openai",
       "options": {
-        "baseURL": "{env:LITELLM_BASE_URL}/v1",
-        "apiKey": "{env:LITELLM_API_KEY}"
+        "baseURL": "{env:AI_GATEWAY_BASE_URL}/v1",
+        "apiKey": "{env:AI_GATEWAY_API_KEY}"
       },
       "models": {
         "gpt-5.4": {
@@ -31,6 +31,22 @@
           "limit": { "context": 400000, "input": 272000, "output": 128000 }
         }
       }
+    },
+    "ai-gateway": {
+      "name": "AI Gateway",
+      "npm": "@ai-sdk/openai-compatible",
+      "options": {
+        "baseURL": "{env:AI_GATEWAY_BASE_URL}/v1",
+        "apiKey": "{env:AI_GATEWAY_API_KEY}"
+      },
+      "models": {
+        "minimax-m2.5": {
+          "name": "MiniMax M2.5",
+          "reasoning": true,
+          "modalities": { "input": ["text"], "output": ["text"] },
+          "limit": { "context": 204800, "output": 131072 }
+        }
+      }
     }
   },
   "permission": {