feat: 更新模型配置并添加 PackyCode 服务支持

- 将多个代理的模型配置从 claude-sonnet-4-5 更新为指定的最新版本模型。
- 添加 PackyCode 服务配置，支持 Claude Opus 4.5 和 Claude Sonnet 4.5 模型。

oh-my-opencode.jsonc

@@ -3,15 +3,18 @@
   "agents": {
     "sisyphus": {
       // Primary orchestrator
-      "model": "anthropic-gateway/claude-sonnet-4-5"
+      // "model": "anthropic-gateway/claude-sonnet-4-5"
+      "model": "packycode/claude-opus-4-5-20251101"
     },
     "prometheus": {
       // Strategic planning
-      "model": "anthropic-gateway/claude-sonnet-4-5"
+      // "model": "anthropic-gateway/claude-sonnet-4-5"
+      "model": "packycode/claude-opus-4-5-20251101"
     },
     "atlas": {
       // Master orchestrator
-      "model": "anthropic-gateway/claude-sonnet-4-5"
+      // "model": "anthropic-gateway/claude-sonnet-4-5"
+      "model": "packycode/claude-sonnet-4-5-20250929"
     },
     "oracle": {
       // Consultation, debugging

opencode.jsonc

@@ -75,6 +75,22 @@
           "name": "GLM-4.7"
         }
       }
+    },
+    "packycode": {
+      "name": "PackyCode",
+      "npm": "@ai-sdk/anthropic",
+      "options": {
+        "baseURL": "https://www.packyapi.com/v1",
+        "apiKey": "{env:PACKY_API_KEY}"
+      },
+      "models": {
+        "claude-opus-4-5": {
+          "name": "Claude Opus 4.5"
+        },
+        "claude-sonnet-4-5": {
+          "name": "Claude Sonnet 4.5"
+        }
+      }
     }
   }
 }