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/perplexity.json

@@ -0,0 +1,46 @@
+{
+  "description": "Perplexity Sonar 系列模型规格。参数来源：config-center compute/providers/perplexity.json。所有模型均内置实时联网搜索能力。",
+  "specs": [
+    {
+      "id": "sonar-pro",
+      "displayName": "Sonar Pro",
+      "family": "sonar-pro",
+      "match": { "exact": ["sonar-pro"] },
+      "spec": {
+        "contextWindow": 200000,
+        "maxOutputTokens": 8192,
+        "capabilities": ["chat", "web_search", "reasoning", "citation"],
+        "serviceType": ["chat"],
+        "description": "Perplexity 旗舰搜索增强模型，内置实时联网搜索和引用，200K 上下文"
+      }
+    },
+    {
+      "id": "sonar-reasoning-pro",
+      "displayName": "Sonar Reasoning Pro",
+      "family": "sonar-reasoning",
+      "match": { "exact": ["sonar-reasoning-pro"], "patterns": ["sonar-reasoning*"] },
+      "spec": {
+        "contextWindow": 128000,
+        "maxOutputTokens": 8192,
+        "capabilities": ["chat", "web_search", "reasoning", "deep_thinking"],
+        "serviceType": ["chat"],
+        "defaultTemperature": null,
+        "supportsReasoning": true,
+        "description": "Perplexity 深度推理模型，内置联网搜索和深度思考"
+      }
+    },
+    {
+      "id": "sonar",
+      "displayName": "Sonar",
+      "family": "sonar",
+      "match": { "exact": ["sonar"], "patterns": ["sonar-*"] },
+      "spec": {
+        "contextWindow": 128000,
+        "maxOutputTokens": 4096,
+        "capabilities": ["chat", "web_search", "citation", "fast"],
+        "serviceType": ["chat"],
+        "description": "Perplexity 轻量搜索模型，低成本联网搜索"
+      }
+    }
+  ]
+}