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/system-settings.md

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+# System Settings
+
+## One-Liner
+
+**System Settings manages global and project-level configuration** — Controls hooks, agents, skills, and core system behavior.
+
+---
+
+## Configuration Files
+
+| File | Scope | Purpose |
+|------|-------|---------|
+| `~/.claude/CLAUDE.md` | Global | Global instructions |
+| `.claude/CLAUDE.md` | Project | Project instructions |
+| `~/.claude/cli-tools.json` | Global | CLI tool config |
+| `.claude/settings.json` | Project | Project settings |
+| `.claude/settings.local.json` | Local | Local overrides |
+
+---
+
+## Settings Schema
+
+```json
+{
+  "permissions": {
+    "allow": ["Bash(npm install)", "Bash(git status)"],
+    "deny": ["Bash(rm -rf)"]
+  },
+  "env": {
+    "ANTHROPIC_API_KEY": "your-key"
+  },
+  "enableAll": false,
+  "autoCheck": true
+}
+```
+
+---
+
+## Key Settings
+
+### Permissions
+
+```json
+{
+  "permissions": {
+    "allow": [
+      "Bash(npm run*)",
+      "Read(**)",
+      "Edit(**/*.ts)"
+    ],
+    "deny": [
+      "Bash(rm -rf /*)"
+    ]
+  }
+}
+```
+
+### Hooks
+
+```json
+{
+  "hooks": {
+    "PreToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [".claude/hooks/pre-bash.sh"]
+      }
+    ]
+  }
+}
+```
+
+### MCP Servers
+
+```json
+{
+  "mcpServers": {
+    "ccw-tools": {
+      "command": "node",
+      "args": ["./mcp-server/dist/index.js"]
+    }
+  }
+}
+```
+
+---
+
+## Hook Configuration
+
+Hooks are scripts that run at specific events:
+
+| Event | When | Use Case |
+|-------|------|----------|
+| `PreToolUse` | Before tool execution | Validation, logging |
+| `PostToolUse` | After tool execution | Cleanup, notifications |
+| `Notification` | On notifications | Custom handlers |
+| `Stop` | On session end | Cleanup |
+
+### Hook Example
+
+```bash
+#!/bin/bash
+# .claude/hooks/pre-bash.sh
+echo "Executing: $1" >> ~/.claude/bash.log
+```
+
+---
+
+## Agent Configuration
+
+```json
+// .claude/agents/my-agent.md
+---
+description: Custom analysis agent
+model: claude-sonnet
+tools:
+  - Read
+  - Grep
+---
+
+# Agent Instructions
+...
+```
+
+---
+
+## Related Links
+
+- [API Settings](/features/api-settings) - API configuration
+- [CLI Call](/features/cli) - Command invocation
+- [Dashboard](/features/dashboard) - Visual management