Add page metadata specification for visual UI design

[Copilot]

Page Metadata Definition Implementation

This PR implements comprehensive page metadata rules for ObjectQL, enabling visual design interface support similar to mainstream low-code platforms like Airtable, Retool, and Appsmith.

✅ Completed Tasks

• Type Definitions - Created comprehensive PageConfig interface in @objectql/types
• Loader Integration - Updated @objectql/core loader to support *.page.yml files
• Example Pages - Created 4 comprehensive examples with documentation
• Comprehensive Testing - 9 new tests, all 69 tests passing ✅
• Documentation
  • User Guide: docs/guide/page-metadata.md
  • Technical Spec: docs/spec/page.md
  • Updated docs/spec/index.md to include Pages in Presentation Layer
  • Updated docs/spec/metadata-standard.md with Pages section
  • Added Pages to file organization structure
  • Updated VitePress navigation
• Code Review & Security - All feedback addressed, CodeQL: 0 alerts ✅

📝 Documentation Updates (Latest)

Updated specification documentation to properly include the new Pages metadata type:

1. docs/spec/index.md

   • Added Pages to Presentation Layer section
   • Updated file organization to include *.page.yml files

2. docs/spec/metadata-standard.md

   • Added comprehensive Pages section with examples
   • Updated metadata taxonomy introduction
   • Updated "Next Steps" and "Reference" sections

🎯 Key Features

• Multiple layout types (7 layouts for various use cases)
• Rich component library (20+ built-in component types)
• Data integration with ObjectQL data sources
• Interactive actions (navigate, modals, forms, custom handlers)
• Responsive design (mobile/tablet/desktop)
• Access control and state management
• AI context for code generation

This implementation provides a solid foundation for building visual design tools on top of ObjectQL while maintaining the metadata-first philosophy.

Original prompt

参考主流低代码平台的方案定义page元数据的规则，要求方便，后期设计可视化的设计界面。比如airtable

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[hotlong]

@copilot 更新文档规范

[Copilot]

@copilot 更新文档规范

Updated the documentation specification in commit 330f647:

• Added Pages section to docs/spec/metadata-standard.md with complete examples
• Updated docs/spec/index.md to include Pages in the Presentation Layer
• Added *.page.yml to the file organization structure
• Updated all relevant cross-references and navigation links

The documentation now properly reflects Pages as part of the metadata standard alongside Views, Forms, and Reports.