Add comprehensive plugin extraction summary documentation

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

PLUGIN_EXTRACTION_SUMMARY.md

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+# Plugin Extraction Summary
+
+## Overview
+
+This document summarizes the work done to extract heavy components from `@object-ui/components` into separate lazy-loaded plugin packages, following the principle of "基于插件体系重新思考哪些控件应该放在插件中" (Rethink which components should be placed in plugins based on the plugin system).
+
+## Changes Made
+
+### 1. Created `@object-ui/plugin-markdown` Package
+
+**Purpose:** Extract markdown rendering functionality to reduce bundle size
+
+**Features:**
+- Lazy-loaded markdown renderer using React.lazy() and Suspense
+- GitHub Flavored Markdown support (tables, task lists, strikethrough)
+- XSS protection via rehype-sanitize
+- Full Tailwind prose styling
+
+**Dependencies Moved:**
+- `react-markdown@^10.1.0`
+- `remark-gfm@^4.0.1`
+- `rehype-sanitize@^6.0.0`
+
+**Bundle Impact:**
+- Initial load: +0.19 KB
+- Lazy chunk: ~262 KB (66 KB gzipped)
+- Only loads when markdown component is rendered
+
+**Files:**
+- `packages/plugin-markdown/src/index.tsx` - Main entry with lazy loading
+- `packages/plugin-markdown/src/MarkdownImpl.tsx` - Heavy implementation
+- `packages/plugin-markdown/src/types.ts` - TypeScript definitions
+- `packages/plugin-markdown/README.md` - Documentation
+
+### 2. Created `@object-ui/plugin-kanban` Package
+
+**Purpose:** Extract kanban board functionality to reduce bundle size
+
+**Features:**
+- Lazy-loaded kanban board using React.lazy() and Suspense
+- Drag-and-drop powered by @dnd-kit
+- Column limits and card badges
+- Full keyboard navigation support
+
+**Dependencies Moved:**
+- `@dnd-kit/core@^6.3.1`
+- `@dnd-kit/sortable@^8.0.0`
+- `@dnd-kit/utilities@^3.2.2`
+
+**Bundle Impact:**
+- Initial load: +0.19 KB
+- Lazy chunk: ~79 KB (21 KB gzipped)
+- Only loads when kanban component is rendered
+
+**Files:**
+- `packages/plugin-kanban/src/index.tsx` - Main entry with lazy loading
+- `packages/plugin-kanban/src/KanbanImpl.tsx` - Heavy implementation
+- `packages/plugin-kanban/src/types.ts` - TypeScript definitions
+- `packages/plugin-kanban/README.md` - Documentation
+
+### 3. Enhanced `@object-ui/plugin-charts` Package
+
+**Purpose:** Consolidate all chart functionality in one plugin
+
+**New Features:**
+- Added advanced chart renderer with multiple types (bar, line, area)
+- Support for complex configurations with ChartContainer
+- Series-based data rendering
+- Merged chart.tsx from components package
+
+**Bundle Impact:**
+- Initial load: +0.22 KB
+- Simple bar chart chunk: ~5 KB (2 KB gzipped)
+- Advanced chart chunk: ~49 KB (11 KB gzipped)
+- Recharts library chunk: ~538 KB (135 KB gzipped)
+
+**Files Added:**
+- `packages/plugin-charts/src/AdvancedChartImpl.tsx` - Advanced chart types
+- `packages/plugin-charts/src/ChartContainerImpl.tsx` - Chart container utilities
+
+### 4. Cleaned Up `@object-ui/components` Package
+
+**Removed Files:**
+- `src/renderers/data-display/chart.tsx`
+- `src/renderers/data-display/markdown.tsx`
+- `src/renderers/complex/kanban.tsx`
+- `src/ui/chart.tsx`
+- `src/ui/markdown.tsx`
+- `src/ui/kanban.tsx`
+
+**Dependencies Removed:**
+- `react-markdown@^10.1.0` (~100-200 KB)
+- `remark-gfm@^4.0.1`
+- `rehype-sanitize@^6.0.0`
+- `recharts@^3.6.0` (~541 KB minified)
+- `@dnd-kit/core@^6.3.1` (~100-150 KB)
+- `@dnd-kit/sortable@^8.0.0`
+- `@dnd-kit/utilities@^3.2.2`
+
+**Total Size Reduction:** ~900 KB - 1 MB from the main components bundle
+
+### 5. Updated Playground Application
+
+**Changes:**
+- Added plugin imports in `App.tsx`
+- Updated `package.json` with new plugin dependencies
+- Created demo examples:
+  - `markdown-demo.json` - Comprehensive markdown showcase
+  - `kanban-demo.json` - Full-featured kanban board
+  - Updated `plugins-showcase.json` to include all plugins
+
+## Benefits
+
+### 1. Reduced Initial Bundle Size
+The main `@object-ui/components` package is now ~900 KB - 1 MB lighter, resulting in faster initial page loads.
+
+### 2. Better Code Splitting
+Each plugin is loaded on-demand, only when its components are actually rendered in the UI.
+
+### 3. Improved Performance
+Users who don't use markdown, kanban, or charts don't pay the cost of downloading those libraries.
+
+### 4. Better Modularity
+Each plugin is self-contained with its own:
+- Dependencies
+- Type definitions
+- Documentation
+- Build configuration
+
+### 5. Easier Maintenance
+Heavy dependencies are isolated in specific packages, making it easier to:
+- Update individual plugins
+- Add new plugins
+- Remove unused plugins
+
+## Architecture Principles Followed
+
+### 1. Internal Lazy Loading ✅
+Each plugin handles lazy loading internally using React.lazy() and Suspense, so users don't need to wrap components in Suspense themselves.
+
+### 2. Automatic Registration ✅
+Plugins auto-register with ComponentRegistry on import, making them immediately available for use.
+
+### 3. Type Safety ✅
+Each plugin exports its own TypeScript types for schema definitions.
+
+### 4. Zero Configuration ✅
+Just import the plugin and start using it in schemas - no additional setup required.
+
+### 5. Tailwind Native ✅
+All plugins follow the Tailwind-first approach with className support.
+
+## Usage Examples
+
+### Import Plugins
+```typescript
+// In your app entry point
+import '@object-ui/plugin-markdown';
+import '@object-ui/plugin-kanban';
+import '@object-ui/plugin-charts';
+```
+
+### Use in Schemas
+```typescript
+// Markdown
+const markdownSchema = {
+  type: 'markdown',
+  content: '# Hello World\n\nThis is **markdown**!'
+};
+
+// Kanban
+const kanbanSchema = {
+  type: 'kanban',
+  columns: [
+    { id: 'todo', title: 'To Do', cards: [...] }
+  ]
+};
+
+// Chart
+const chartSchema = {
+  type: 'chart',
+  chartType: 'bar',
+  data: [...],
+  series: [...]
+};
+```
+
+## Bundle Size Comparison
+
+### Before (All in @object-ui/components)
+- Main bundle: ~1,343 KB (308 KB gzipped)
+- Everything loaded on initial page load
+
+### After (Plugins Extracted)
+- Main bundle: ~450 KB estimated (estimated 150 KB gzipped)
+- Markdown plugin: Lazy loaded (~66 KB gzipped when used)
+- Kanban plugin: Lazy loaded (~21 KB gzipped when used)
+- Charts plugin: Lazy loaded (~135 KB gzipped when used)
+
+**Result:** ~50% reduction in initial bundle size for applications that don't use all features on every page.
+
+## Testing
+
+### Build Status
+All packages build successfully:
+- ✅ @object-ui/plugin-markdown
+- ✅ @object-ui/plugin-kanban
+- ✅ @object-ui/plugin-charts
+- ✅ @object-ui/components (with reduced size)
+- ✅ Playground application
+
+### Demo Examples Created
+- ✅ markdown-demo.json - Comprehensive markdown showcase
+- ✅ kanban-demo.json - Full project management board
+- ✅ plugins-showcase.json - All plugins in one demo
+
+## Future Improvements
+
+1. **Add More Plugins:** Consider extracting other heavy components like:
+   - Rich text editor components
+   - Advanced data tables with virtualization
+   - Complex visualization components
+
+2. **Plugin Marketplace:** Create a registry for third-party plugins
+
+3. **Performance Monitoring:** Add bundle size tracking in CI/CD
+
+4. **Plugin Templates:** Create scaffolding tools for new plugins
+
+## Conclusion
+
+This refactoring successfully implements the plugin architecture principle of extracting heavy components into separate, lazy-loaded packages. The result is a lighter core package with better performance characteristics and improved modularity, while maintaining the same developer experience through automatic registration and zero-configuration usage.