feat(model-specs): 新增模型规格库——跨 provider 模型参数统一维护（presetDataVersion 54→58）

* feat(model-specs): 新增模型规格库与 schema 契约

- compute/model-specs/：按厂商维护模型内在参数（上下文窗口/最大输出/能力/serviceType/默认温度，不含价签）
- schemas/model-spec.schema.json：Draft-07 契约，spec 允许 null（新文件不影响老客户端 frozen 契约）
- scripts/validate.mjs：pickSchemaKey 纳入 model-specs 校验
- manifest.presetDataVersion 54→55

* feat(model-specs): 新增小米 MiMo 系列模型规格；bump presetDataVersion 55→56

* feat(model-specs): 补全全量模型规格；presetDataVersion 56→57

* feat(model-specs): 新增 releasedAt/retiredAt 时间戳字段；补充 mimo 退役日期

compute/model-specs/mistral.json

@@ -0,0 +1,44 @@
+{
+  "description": "Mistral 系列模型规格。参数来源：config-center compute/providers/mistral.json。",
+  "specs": [
+    {
+      "id": "mistral-large-latest",
+      "displayName": "Mistral Large",
+      "family": "mistral-large",
+      "match": { "patterns": ["mistral-large*"] },
+      "spec": {
+        "contextWindow": 256000,
+        "maxOutputTokens": 262144,
+        "capabilities": ["chat", "reasoning", "code", "vision", "tool_use", "long_context"],
+        "serviceType": ["chat"],
+        "defaultTemperature": 0.7
+      }
+    },
+    {
+      "id": "mistral-small-latest",
+      "displayName": "Mistral Small",
+      "family": "mistral-small",
+      "match": { "patterns": ["mistral-small*"] },
+      "spec": {
+        "contextWindow": 128000,
+        "maxOutputTokens": 8192,
+        "capabilities": ["chat", "code", "vision", "reasoning", "fast", "tool_use"],
+        "serviceType": ["fast"],
+        "defaultTemperature": 0.7
+      }
+    },
+    {
+      "id": "codestral-latest",
+      "displayName": "Codestral",
+      "family": "codestral",
+      "match": { "patterns": ["codestral*"] },
+      "spec": {
+        "contextWindow": 128000,
+        "maxOutputTokens": 32768,
+        "capabilities": ["code", "fill_in_the_middle"],
+        "serviceType": ["chat"],
+        "defaultTemperature": 0.7
+      }
+    }
+  ]
+}