feat: 更新代理模型配置，启用新推荐模型

- 更新代理模型配置，移除被注释的旧模型并启用新的推荐模型。

oh-my-opencode.jsonc

@@ -2,9 +2,11 @@
   "$schema": "https://raw.githubusercontent.com/code-yeongyu/oh-my-opencode/master/assets/oh-my-opencode.schema.json",
   "agents": {
     "Sisyphus": {
+      // "model": "anthropic-gateway/claude-opus-4-5"
       "model": "anthropic-gateway/claude-sonnet-4-5"
     },
     "Planner-Sisyphus": {
+      // "model": "anthropic-gateway/claude-opus-4-5"
       "model": "anthropic-gateway/claude-opus-4-5-thinking"
     },
     "oracle": {
@@ -14,9 +16,11 @@
       "model": "google-gateway/gemini-3-pro-high"
     },
     "librarian": {
+      // "model": "opencode/glm-4.7-free"
       "model": "anthropic-gateway/claude-haiku-4-5"
     },
     "explore": {
+      // "model": "opencode/grok-code"
       "model": "anthropic-gateway/claude-haiku-4-5"
     },
     "document-writer": {