docs: add VitePress documentation site

- Add docs directory with VitePress configuration
- Add GitHub Actions workflow for docs build and deploy
- Support bilingual (English/Chinese) documentation
- Include search, custom theme, and responsive design

docs/features/dashboard.md

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+# Dashboard Panel
+
+## One-Liner
+
+**The Dashboard is a VS Code webview-based management interface** — Provides visual access to project configuration, specs, memory, and settings through an intuitive GUI.
+
+---
+
+## Pain Points Solved
+
+| Pain Point | Current State | Dashboard Solution |
+|------------|---------------|-------------------|
+| **Config complexity** | JSON files hard to edit | Visual form-based editing |
+| **No overview** | Can't see project state at a glance | Unified dashboard view |
+| **Scattered settings** | Settings in multiple files | Centralized management |
+| **No visual feedback** | CLI only, no UI | Interactive webview |
+
+---
+
+## Core Features
+
+| Feature | Description |
+|---------|-------------|
+| **Project Overview** | Tech stack, dependencies, status |
+| **Spec Manager** | View and edit specification files |
+| **Memory Viewer** | Browse persistent memories |
+| **API Settings** | Configure AI model endpoints |
+| **System Settings** | Global and project settings |
+
+---
+
+## Access
+
+Open via VS Code command palette:
+```
+CCW: Open Dashboard
+```
+
+Or via CLI:
+```bash
+ccw view
+```
+
+---
+
+## Dashboard Sections
+
+### 1. Project Overview
+- Technology stack detection
+- Dependency status
+- Workflow session status
+
+### 2. Spec Manager
+- List all specs
+- Edit spec content
+- Enable/disable specs
+
+### 3. Memory Viewer
+- Browse memory entries
+- Search memories
+- Export/import
+
+### 4. API Settings
+- Configure API keys
+- Set model endpoints
+- Manage rate limits
+
+### 5. System Settings
+- Global configuration
+- Project overrides
+- Hook management
+
+---
+
+## Related Links
+
+- [API Settings](/features/api-settings) - API configuration
+- [System Settings](/features/system-settings) - System configuration
+- [Spec System](/features/spec) - Specification management