release(v0.2.0): streaming, MCP protocol, Browser Hand, security enhancements

## Major Features

### Streaming Response System
- Implement LlmDriver trait with `stream()` method returning async Stream
- Add SSE parsing for Anthropic and OpenAI API streaming
- Integrate Tauri event system for frontend streaming (`stream:chunk` events)
- Add StreamChunk types: Delta, ToolStart, ToolEnd, Complete, Error

### MCP Protocol Implementation
- Add MCP JSON-RPC 2.0 types (mcp_types.rs)
- Implement stdio-based MCP transport (mcp_transport.rs)
- Support tool discovery, execution, and resource operations

### Browser Hand Implementation
- Complete browser automation with Playwright-style actions
- Support Navigate, Click, Type, Scrape, Screenshot, Wait actions
- Add educational Hands: Whiteboard, Slideshow, Speech, Quiz

### Security Enhancements
- Implement command whitelist/blacklist for shell_exec tool
- Add SSRF protection with private IP blocking
- Create security.toml configuration file

## Test Improvements
- Fix test import paths (security-utils, setup)
- Fix vi.mock hoisting issues with vi.hoisted()
- Update test expectations for validateUrl and sanitizeFilename
- Add getUnsupportedLocalGatewayStatus mock

## Documentation Updates
- Update architecture documentation
- Improve configuration reference
- Add quick-start guide updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hands/slideshow.HAND.toml

@@ -0,0 +1,119 @@
+# Slideshow Hand - 幻灯片控制能力包
+#
+# ZCLAW Hand 配置
+# 提供幻灯片演示控制能力，支持翻页、聚焦、激光笔等
+
+[hand]
+name = "slideshow"
+version = "1.0.0"
+description = "幻灯片控制能力包 - 控制演示文稿的播放、导航和标注"
+author = "ZCLAW Team"
+
+type = "presentation"
+requires_approval = false
+timeout = 30
+max_concurrent = 1
+
+tags = ["slideshow", "presentation", "slides", "education", "teaching"]
+
+[hand.config]
+# 支持的幻灯片格式
+supported_formats = ["pptx", "pdf", "html", "markdown"]
+
+# 自动翻页间隔（秒），0 表示禁用
+auto_advance_interval = 0
+
+# 是否显示进度条
+show_progress = true
+
+# 是否显示页码
+show_page_number = true
+
+# 激光笔颜色
+laser_color = "#ff0000"
+
+# 聚焦框颜色
+spotlight_color = "#ffcc00"
+
+[hand.triggers]
+manual = true
+schedule = false
+webhook = false
+
+[[hand.triggers.events]]
+type = "chat.intent"
+pattern = "幻灯片|演示|翻页|下一页|上一页|slide|presentation|next|prev"
+priority = 5
+
+[hand.permissions]
+requires = [
+  "slideshow.navigate",
+  "slideshow.annotate",
+  "slideshow.control"
+]
+
+roles = ["operator.read"]
+
+[hand.rate_limit]
+max_requests = 200
+window_seconds = 3600
+
+[hand.audit]
+log_inputs = true
+log_outputs = false
+retention_days = 7
+
+# 幻灯片动作定义
+[[hand.actions]]
+id = "next_slide"
+name = "下一页"
+description = "切换到下一张幻灯片"
+params = {}
+
+[[hand.actions]]
+id = "prev_slide"
+name = "上一页"
+description = "切换到上一张幻灯片"
+params = {}
+
+[[hand.actions]]
+id = "goto_slide"
+name = "跳转到指定页"
+description = "跳转到指定编号的幻灯片"
+params = { slide_number = "number" }
+
+[[hand.actions]]
+id = "spotlight"
+name = "聚焦元素"
+description = "用高亮框聚焦指定元素"
+params = { element_id = "string", duration = "number?" }
+
+[[hand.actions]]
+id = "laser"
+name = "激光笔"
+description = "在幻灯片上显示激光笔指示"
+params = { x = "number", y = "number", duration = "number?" }
+
+[[hand.actions]]
+id = "highlight"
+name = "高亮区域"
+description = "高亮显示幻灯片上的区域"
+params = { x = "number", y = "number", width = "number", height = "number", color = "string?" }
+
+[[hand.actions]]
+id = "play_animation"
+name = "播放动画"
+description = "触发幻灯片上的动画效果"
+params = { animation_id = "string" }
+
+[[hand.actions]]
+id = "pause"
+name = "暂停"
+description = "暂停自动播放"
+params = {}
+
+[[hand.actions]]
+id = "resume"
+name = "继续"
+description = "继续自动播放"
+params = {}