feat: 拆分 providers.json 为按 Provider 独立文件

将 compute/providers.json（54KB, 14 providers, 99 models）拆分为
compute/providers/ 目录下的独立 JSON 文件，便于维护和按需更新。

新增文件：
- compute/providers/_index.json — 加载顺序索引（保证 digest 确定性）
- compute/providers/{provider}.json × 14 — 各 provider 独立配置

保留 compute/providers.json 供旧客户端向后兼容（过渡期）。

presetDataVersion: 2 → 3

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

compute/providers/anthropic.json

@@ -0,0 +1,109 @@
+{
+  "id": "provider-anthropic-001",
+  "provider": "anthropic",
+  "label": "Anthropic",
+  "baseUrl": "https://api.anthropic.com/v1",
+  "apiFormat": "anthropic-messages",
+  "apiKeyRef": "anthropic",
+  "apiKeyVerified": false,
+  "enabled": false,
+  "status": "unconfigured",
+  "services": [
+    "chat",
+    "computer_use"
+  ],
+  "defaultTemperature": 1,
+  "defaultTopP": 1,
+  "models": [
+    {
+      "modelName": "claude-opus-4.6",
+      "displayName": "Claude Opus 4.6",
+      "serviceType": "chat",
+      "description": "Anthropic 最新旗舰 Opus 模型，最强能力",
+      "contextWindow": 200000,
+      "maxOutputTokens": 32000,
+      "capabilities": [
+        "chat",
+        "reasoning",
+        "code",
+        "vision",
+        "tool_use"
+      ],
+      "inputPrice": 5,
+      "outputPrice": 25,
+      "extra": {}
+    },
+    {
+      "modelName": "claude-opus-4.5",
+      "displayName": "Claude Opus 4.5",
+      "serviceType": "chat",
+      "description": "Anthropic Opus 4.5，顶级推理能力",
+      "contextWindow": 200000,
+      "maxOutputTokens": 32000,
+      "capabilities": [
+        "chat",
+        "reasoning",
+        "code",
+        "vision",
+        "tool_use"
+      ],
+      "inputPrice": 5,
+      "outputPrice": 25,
+      "extra": {}
+    },
+    {
+      "modelName": "claude-sonnet-4.5",
+      "displayName": "Claude Sonnet 4.5",
+      "serviceType": "chat",
+      "description": "Anthropic Sonnet 4.5，高性能性价比",
+      "contextWindow": 200000,
+      "maxOutputTokens": 64000,
+      "capabilities": [
+        "chat",
+        "reasoning",
+        "code",
+        "vision",
+        "tool_use"
+      ],
+      "inputPrice": 3,
+      "outputPrice": 15,
+      "extra": {}
+    },
+    {
+      "modelName": "claude-sonnet-4",
+      "displayName": "Claude Sonnet 4",
+      "serviceType": "chat",
+      "description": "Anthropic Sonnet 4 旗舰模型",
+      "contextWindow": 200000,
+      "maxOutputTokens": 64000,
+      "capabilities": [
+        "chat",
+        "reasoning",
+        "code",
+        "vision",
+        "tool_use"
+      ],
+      "inputPrice": 3,
+      "outputPrice": 15,
+      "extra": {}
+    },
+    {
+      "modelName": "claude-sonnet-4.5-computer",
+      "displayName": "Claude Sonnet 4.5 Computer Use",
+      "serviceType": "computer_use",
+      "description": "Anthropic 最佳 Computer Use 模型",
+      "contextWindow": 200000,
+      "maxOutputTokens": 64000,
+      "capabilities": [
+        "chat",
+        "vision",
+        "computer_use",
+        "tool_use",
+        "reasoning"
+      ],
+      "inputPrice": 3,
+      "outputPrice": 15,
+      "extra": {}
+    }
+  ]
+}