feat(compute): 新增 ChatGPT 订阅 (Codex) Provider 预设 (#33)

自动检测客户端本地 Codex CLI 的 ChatGPT 订阅授权（~/.codex/auth.json），
以用户订阅额度调用 gpt-5.x/codex 模型，无需 API Key。

- compute/providers/openai-codex.json：accessMode=coding-plan +
  credentialSource=codex-cli + apiFormat=openai-codex-responses，5 个模型，
  enabled=false（由客户端检测器按本地凭证自动启用）
- schemas/provider.schema.json：frozen baseline 新增 credentialSource 字段
- manifest.json：presetDataVersion 59 → 60

⚠️ 发布顺序：本数据引入老客户端不识别的 credentialSource 字段。必须先发布带
compute.json 韧性（容忍未知字段）的客户端并等自动更新铺开，再合并本 PR——
否则更早的客户端合并时会因严格 schema 校验失败而停收所有预设更新。

compute/providers/_index.json

@@ -2,6 +2,7 @@
   "description": "Provider 加载顺序索引",
   "order": [
     "openai",
+    "openai-codex",
     "anthropic",
     "deepseek",
     "dashscope",

compute/providers/openai-codex.json

@@ -0,0 +1,126 @@
+{
+  "id": "provider-openai-codex-plan-001",
+  "provider": "openai-codex",
+  "brandGroup": "openai",
+  "label": "ChatGPT 订阅 (Codex)",
+  "baseUrl": "https://chatgpt.com/backend-api",
+  "apiFormat": "openai-codex-responses",
+  "apiKeyRef": "openai-codex-access-token",
+  "apiKeyVerified": false,
+  "enabled": false,
+  "status": "unconfigured",
+  "priceCurrency": "USD",
+  "accessMode": "coding-plan",
+  "credentialSource": "codex-cli",
+  "codingPlan": {
+    "quotas": {},
+    "usageTracking": {
+      "method": "none",
+      "consoleUrl": "https://chatgpt.com/codex/settings/usage"
+    }
+  },
+  "services": [
+    "chat",
+    "reasoning"
+  ],
+  "models": [
+    {
+      "modelName": "gpt-5.5",
+      "displayName": "GPT-5.5 (订阅)",
+      "serviceType": [
+        "chat"
+      ],
+      "description": "ChatGPT 订阅额度计费，旗舰模型，272K 上下文",
+      "contextWindow": 272000,
+      "maxOutputTokens": 128000,
+      "capabilities": [
+        "chat",
+        "reasoning",
+        "code",
+        "vision",
+        "long_context",
+        "tool_use",
+        "agent"
+      ],
+      "source": "preset"
+    },
+    {
+      "modelName": "gpt-5.4",
+      "displayName": "GPT-5.4 (订阅)",
+      "serviceType": [
+        "chat"
+      ],
+      "description": "ChatGPT 订阅额度计费，高阶通用模型，272K 上下文",
+      "contextWindow": 272000,
+      "maxOutputTokens": 128000,
+      "capabilities": [
+        "chat",
+        "reasoning",
+        "code",
+        "vision",
+        "long_context",
+        "tool_use",
+        "agent"
+      ],
+      "source": "preset"
+    },
+    {
+      "modelName": "gpt-5.3-codex",
+      "displayName": "GPT-5.3 Codex (订阅)",
+      "serviceType": [
+        "chat"
+      ],
+      "description": "ChatGPT 订阅额度计费，编程专用旗舰，272K 上下文",
+      "contextWindow": 272000,
+      "maxOutputTokens": 128000,
+      "capabilities": [
+        "chat",
+        "reasoning",
+        "code",
+        "vision",
+        "long_context",
+        "tool_use",
+        "agent"
+      ],
+      "source": "preset"
+    },
+    {
+      "modelName": "gpt-5.2-codex",
+      "displayName": "GPT-5.2 Codex (订阅)",
+      "serviceType": [
+        "chat"
+      ],
+      "description": "ChatGPT 订阅额度计费，编程专用模型，272K 上下文",
+      "contextWindow": 272000,
+      "maxOutputTokens": 128000,
+      "capabilities": [
+        "chat",
+        "reasoning",
+        "code",
+        "vision",
+        "long_context",
+        "tool_use",
+        "agent"
+      ],
+      "source": "preset"
+    },
+    {
+      "modelName": "gpt-5.1-codex-mini",
+      "displayName": "GPT-5.1 Codex Mini (订阅)",
+      "serviceType": [
+        "chat"
+      ],
+      "description": "ChatGPT 订阅额度计费，轻量编程模型，272K 上下文",
+      "contextWindow": 272000,
+      "maxOutputTokens": 128000,
+      "capabilities": [
+        "chat",
+        "code",
+        "vision",
+        "long_context",
+        "tool_use"
+      ],
+      "source": "preset"
+    }
+  ]
+}