refactor: 重构代理配置并统一插件管理

- 添加新的配置文件以定义多个代理模型及其对应的服务设置。
- 移除旧插件和MCP配置，替换为单一的oh-my-opencode插件

oh-my-opencode.jsonc

@@ -0,0 +1,27 @@
+{
+  "$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"
+    },
+    "librarian": {
+      "model": "google-gateway/gemini-3-flash"
+    },
+    "explore": {
+      "model": "opencode/grok-code"
+    },
+    "oracle": {
+      "model": "opencode/glm-4.7-free"
+    },
+    "frontend-ui-ux-engineer": {
+      "model": "google-gateway/gemini-3-pro-high"
+    },
+    "document-writer": {
+      "model": "google/antigravity-gemini-3-flash"
+    },
+    "multimodal-looker": {
+      "model": "google/antigravity-gemini-3-flash"
+    }
+  }
+}