Add README.md to document unified skill structure

Agent-Logs-Url: https://github.com/objectstack-ai/objectui/sessions/e818ab48-f8a6-450b-a6b8-69b3e7e3e3b7

Co-authored-by: xuyushun441-sys <255036401+xuyushun441-sys@users.noreply.github.com>

Author: Claude

skills/objectui/README.md

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+# ObjectUI Copilot Skill
+
+This directory contains the unified ObjectUI Copilot skill, consolidating all ObjectUI development knowledge into a single tree-based structure aligned with [shadcn/ui](https://github.com/shadcn-ui/ui/tree/main/skills/shadcn) best practices.
+
+## Structure
+
+```
+skills/objectui/
+├── SKILL.md                  # Main entry point - core principles & architecture
+├── rules/                    # Global non-negotiable constraints
+│   ├── protocol.md          # JSON Protocol compliance rules
+│   ├── styling.md           # Tailwind & Shadcn styling rules
+│   ├── composition.md       # Component composition patterns
+│   └── no-touch-zones.md    # Protected upstream files
+├── guides/                   # Domain-specific expertise (10 guides)
+│   ├── page-builder.md              # Schema-driven page building
+│   ├── plugin-development.md        # Creating custom plugins
+│   ├── schema-expressions.md        # Expression syntax & debugging
+│   ├── data-integration.md          # DataSource & API integration
+│   ├── project-setup.md             # Project initialization & config
+│   ├── testing.md                   # Testing patterns (Vitest, Storybook, Playwright)
+│   ├── i18n.md                      # Internationalization & localization
+│   ├── mobile.md                    # Mobile responsiveness & PWA
+│   ├── auth-permissions.md          # Authentication & RBAC
+│   └── console-development.md       # Console app development
+├── evals/                    # Evaluation test cases (10 JSON files)
+└── agents/                   # Agent configurations (empty, reserved for future)
+```
+
+## Why This Structure?
+
+### Before (10 Parallel Skills)
+- `skills/objectui-auth-permissions/`
+- `skills/objectui-console-development/`
+- `skills/objectui-data-integration/`
+- `skills/objectui-i18n/`
+- `skills/objectui-mobile/`
+- `skills/objectui-plugin-development/`
+- `skills/objectui-project-setup/`
+- `skills/objectui-schema-expressions/`
+- `skills/objectui-sdui-page-builder/`
+- `skills/objectui-testing/`
+
+**Problems:**
+- Agent had to choose between 10+ skills
+- Cross-skill knowledge was fragmented
+- Maintenance overhead (10 separate manifests)
+- Inconsistent with shadcn/ui single-skill model
+
+### After (1 Tree-Based Skill)
+- `skills/objectui/` (single skill)
+  - `SKILL.md` - unified entry point
+  - `rules/` - global constraints
+  - `guides/` - domain expertise
+
+**Benefits:**
+- ✅ Single unified entry point
+- ✅ AI agent always knows where to look
+- ✅ Global rules apply consistently
+- ✅ Aligned with shadcn/ui architecture
+- ✅ Easier maintenance and updates
+
+## Usage
+
+When working with ObjectUI, the AI agent will:
+
+1. **Start with `SKILL.md`** - Core principles, architecture, and quick reference
+2. **Check `rules/`** - Ensure compliance with non-negotiable constraints
+3. **Consult `guides/`** - Get deep domain expertise for specific tasks
+
+### Example Flow
+
+**User:** "Help me build a dashboard page with ObjectUI"
+
+**Agent:**
+1. Reads `SKILL.md` → Understands core principles
+2. Checks `rules/protocol.md` → Learns JSON schema structure
+3. Checks `rules/styling.md` → Learns Tailwind requirements
+4. Reads `guides/page-builder.md` → Gets dashboard building patterns
+5. Reads `guides/schema-expressions.md` → Learns dynamic expressions
+
+## Maintenance
+
+When adding new content:
+
+- **Core principles or architecture changes** → Update `SKILL.md`
+- **New global rule** → Add to `rules/`
+- **New domain area** → Add guide to `guides/`
+- **New eval test** → Add JSON to `evals/`
+
+## Migration Notes
+
+This structure was created on April 14, 2026, consolidating:
+- 10 parallel skill directories
+- 10 SKILL.md files → 1 SKILL.md + 10 guides
+- 10 evals directories → 1 unified evals/
+- Cross-skill references unified into single namespace
+
+All content preserved and reorganized for better discoverability.
+
+## Reference
+
+- **shadcn/ui skill structure**: https://github.com/shadcn-ui/ui/tree/main/skills/shadcn
+- **Issue**: [#架构优化-将-objectui-多-Copilot-skill-合并为单-skill-树状体系](https://github.com/objectstack-ai/objectui/issues)