docs: add keybinds configuration reference (zh + en)

Document the keybinds settings field following the same format
as enabledSkills and mcpServers:

- Shortcut format: ctrl+key, ctrl+shift+key, meta+key
- Project-over-user merge precedence
- Runtime management via /keybind add|remove|list

Author: al4xdev

docs/configuration.md

@@ -120,6 +120,27 @@ Deep Code 内置免费可用的 Web Search 工具。如果需要自定义搜索
 - 将某个 skill 设置为 `false` 后，所有项目级和用户级目录中解析名称相同的 skill 都会被隐藏。
 - 项目设置会按 skill 覆盖用户设置。如果项目设置没有配置某个 skill，则使用用户设置。
 
+#### `keybinds` — 自定义快捷键
+
+将键盘快捷键绑定到斜杠命令（如 `/exit`、`/new`、`/skills` 等）或 skill 名称，无需输入 `/` 即可触发操作。
+
+```json
+{
+  "keybinds": {
+    "ctrl+e": "exit",
+    "ctrl+n": "new",
+    "ctrl+s": "skills",
+    "ctrl+m": "model"
+  }
+}
+```
+
+- 快捷键格式：`ctrl+key`、`ctrl+shift+key` 或 `meta+key`（例如 `ctrl+e`、`ctrl+shift+i`、`meta+b`）。
+- 键名区分大小写匹配（`ctrl+e` 需按 `Ctrl+E`）。
+- 项目设置会按快捷键覆盖用户设置。如果项目设置中存在同名快捷键，则使用项目设置的值。
+- 自定义快捷键仅在无下拉菜单/弹窗打开时生效，以避免与菜单导航冲突。
+- 也可通过 `/keybind add|remove|list` 命令在运行时管理快捷键。
+
 #### `mcpServers` — MCP 服务器
 
 MCP（Model Context Protocol）服务器配置。值是键值对，键为服务名称，值为服务器配置对象。

docs/configuration_en.md

@@ -120,6 +120,27 @@ Controls whether skills are included during skill scanning. Keys are resolved sk
 - Setting a skill to `false` hides every skill with that resolved `name`, across project and user skill roots.
 - Project settings override user settings per skill. If the project setting omits a skill, the user setting is used.
 
+#### `keybinds` — Custom Keybinds
+
+Bind keyboard shortcuts to slash commands (e.g. `/exit`, `/new`, `/skills`) or skill names, triggering actions without typing `/`.
+
+```json
+{
+  "keybinds": {
+    "ctrl+e": "exit",
+    "ctrl+n": "new",
+    "ctrl+s": "skills",
+    "ctrl+m": "model"
+  }
+}
+```
+
+- Shortcut format: `ctrl+key`, `ctrl+shift+key`, or `meta+key` (e.g. `ctrl+e`, `ctrl+shift+i`, `meta+b`).
+- Letter matching is case-insensitive (`ctrl+e` matches both `Ctrl+E` and `Ctrl+Shift+E` with exact modifier match).
+- Project settings override user settings per shortcut. If a shortcut exists in both, the project value wins.
+- Custom keybinds only fire when no dropdown/menu is open, to avoid conflicts with menu navigation.
+- You can also manage keybinds at runtime via `/keybind add|remove|list`.
+
 #### `mcpServers` — MCP Servers
 
 Configuration for MCP (Model Context Protocol) servers. The value is a key-value pair, where the key is the service name and the value is a server configuration object.