feat(compute): add Xiaomi MiMo-X preview models (#105)

compute/model-specs/xiaomi.json

@@ -1,6 +1,50 @@
 {
   "description": "小米 MiMo 系列模型规格。参数来源：https://platform.xiaomimimo.com/docs/zh-CN/quick-start/model。注意 v2-pro/v2-omni 自 2026-06-01 起转发到 v2.5 系列，2026-06-30 正式停用，规格库仍保留供存量 NewAPI 渠道正确展示参数。",
   "specs": [
+    {
+      "id": "mimo-x-flash-preview",
+      "displayName": "MiMo-X-Flash Preview",
+      "family": "mimo-x-flash-preview",
+      "match": {
+        "exact": [
+          "mimo-x-flash-preview"
+        ]
+      },
+      "spec": {
+        "contextWindow": 1000000,
+        "capabilities": [
+          "chat",
+          "vision"
+        ],
+        "serviceType": [
+          "chat",
+          "vision"
+        ],
+        "description": "小米 MiMo-X Flash 内测模型，1M 上下文，支持图片识别"
+      }
+    },
+    {
+      "id": "mimo-x-pro-preview",
+      "displayName": "MiMo-X-Pro Preview",
+      "family": "mimo-x-pro-preview",
+      "match": {
+        "exact": [
+          "mimo-x-pro-preview"
+        ]
+      },
+      "spec": {
+        "contextWindow": 1000000,
+        "capabilities": [
+          "chat",
+          "vision"
+        ],
+        "serviceType": [
+          "chat",
+          "vision"
+        ],
+        "description": "小米 MiMo-X Pro 内测模型，1M 上下文，支持图片识别"
+      }
+    },
     {
       "id": "mimo-v2.5-pro",
       "displayName": "MiMo V2.5 Pro",