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/xunfei.json

@@ -0,0 +1,34 @@
+{
+  "description": "讯飞星火系列模型规格。参数来源：config-center compute/providers/xunfei.json。spark-x 为推理模型（serviceType: reasoning）。",
+  "specs": [
+    {
+      "id": "spark-x",
+      "displayName": "讯飞星火 X1",
+      "family": "spark-x",
+      "match": { "exact": ["spark-x"], "patterns": ["spark-x*"] },
+      "spec": {
+        "contextWindow": 65536,
+        "maxOutputTokens": 128000,
+        "capabilities": ["chat", "reasoning", "deep_thinking", "math", "code"],
+        "serviceType": ["reasoning"],
+        "defaultTemperature": 1.2,
+        "supportsReasoning": true,
+        "description": "讯飞深度推理模型，64K 输入/128K 输出，支持思考模式与函数调用"
+      }
+    },
+    {
+      "id": "4.0Ultra",
+      "displayName": "讯飞星火 4.0 Ultra",
+      "family": "spark-4",
+      "match": { "exact": ["4.0Ultra"], "patterns": ["4.0Ultra*"] },
+      "spec": {
+        "contextWindow": 32768,
+        "maxOutputTokens": 32768,
+        "capabilities": ["chat", "reasoning", "code", "tool_use"],
+        "serviceType": ["chat"],
+        "defaultTemperature": 1,
+        "description": "讯飞星火最强通用模型，支持推理、代码和工具调用"
+      }
+    }
+  ]
+}