refactor: 移除未使用代理配置并更新图书馆代理模型

- 移除未使用的代理配置并更新图书馆代理模型为 glm-4.7-free，同时移除重复的文档编写代理配置。

oh-my-opencode.jsonc

@@ -1,13 +1,9 @@
 {
   "$schema": "https://raw.githubusercontent.com/code-yeongyu/oh-my-opencode/master/assets/oh-my-opencode.schema.json",
-  "google_auth": false,
   "agents": {
     "sisyphus": {
       "model": "anthropic-gateway/claude-opus-4-5-thinking"
     },
-    "prometheus": {
-      "model": "anthropic-gateway/claude-opus-4-5-thinking"
-    },
     "oracle": {
       "model": "openai-gateway/gpt-5.2"
     },
@@ -15,16 +11,13 @@
       "model": "google-gateway/gemini-3-pro-high"
     },
     "librarian": {
-      "model": "anthropic-gateway/claude-sonnet-4-5"
+      "model": "opencode/glm-4.7-free"
     },
     "explore": {
       "model": "opencode/grok-code"
     },
     "multimodal-looker": {
       "model": "google/antigravity-gemini-3-flash"
-    },
-    "document-writer": {
-      "model": "google/antigravity-gemini-3-flash"
     }
   }
 }