Add README documentation for categorized JSON schema structure

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

Author: Copilot

packages/spec/json-schema/README.md

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+# JSON Schema Directory
+
+This directory contains auto-generated JSON schemas for all ObjectStack protocols, organized by category.
+
+## Directory Structure
+
+The schemas are organized into the following categories matching the protocol structure:
+
+```
+json-schema/
+├── data/       # Data Protocol - Business Logic & Data Modeling (74 schemas)
+├── ui/         # UI Protocol - Presentation & Interaction (39 schemas)
+├── system/     # System Protocol - Runtime Configuration & Security (112 schemas)
+├── ai/         # AI Protocol - AI/ML Capabilities (86 schemas)
+└── api/        # API Protocol - API Contracts & Envelopes (12 schemas)
+```
+
+## Categories
+
+### 📊 Data Protocol (`data/`)
+Core business logic and data modeling schemas:
+- Object, Field, Validation
+- Query (AST), Mapping (ETL)
+- Permission, Sharing, Flow, Workflow
+
+**Example schemas:** `Field.json`, `Object.json`, `Query.json`, `ValidationRule.json`
+
+### 🎨 UI Protocol (`ui/`)
+Presentation and interaction schemas:
+- App, Page, View (Grid/Kanban/Calendar/Gantt)
+- Dashboard (Widgets), Report
+- Action (Triggers), Theme
+
+**Example schemas:** `App.json`, `View.json`, `Dashboard.json`, `Theme.json`
+
+### ⚙️ System Protocol (`system/`)
+Runtime configuration and security schemas:
+- Manifest (Config), Datasource, Driver
+- Role (Hierarchy), Identity (Auth)
+- Webhook (Integration), Policy (Compliance)
+- Plugin Architecture, Audit, Tenant Management
+
+**Example schemas:** `Manifest.json`, `AuthConfig.json`, `Datasource.json`, `AuditEvent.json`
+
+### 🤖 AI Protocol (`ai/`)
+AI/ML capabilities schemas:
+- Agent Configuration
+- Model Registry & Selection
+- RAG Pipeline, NLQ (Natural Language Query)
+- Workflow Automation, Predictive Analytics
+- Conversation Memory & Token Management
+- Cost Tracking & Budget Management
+
+**Example schemas:** `Agent.json`, `ModelRegistry.json`, `RAGPipelineConfig.json`, `NLQRequest.json`
+
+### 🔌 API Protocol (`api/`)
+API contracts and envelopes:
+- Request/Response schemas
+- Error handling
+- Bulk operations
+
+**Example schemas:** `ApiEndpoint.json`, `BaseResponse.json`, `BulkRequest.json`
+
+## Generation
+
+These schemas are automatically generated from Zod schemas during the build process:
+
+```bash
+npm run gen:schema
+```
+
+The generation script is located at `scripts/build-schemas.ts`.
+
+## Usage
+
+### In TypeScript/JavaScript Projects
+
+You can reference these JSON schemas for validation, documentation, or IDE support:
+
+```typescript
+import fieldSchema from '@objectstack/spec/json-schema/data/Field.json';
+```
+
+### In JSON Schema Tools
+
+Use these schemas with any JSON Schema validator or documentation generator:
+
+```bash
+ajv validate -s json-schema/data/Field.json -d myfield.json
+```
+
+### In IDEs
+
+Many IDEs support JSON schema validation. You can reference these schemas in your configuration files:
+
+```json
+{
+  "$schema": "./node_modules/@objectstack/spec/json-schema/data/Object.json"
+}
+```
+
+## Schema Format
+
+All schemas are generated with:
+- **Format:** JSON Schema Draft 7
+- **Strategy:** Self-contained (no external `$ref`s)
+- **Naming:** PascalCase matching the TypeScript type names
+
+## Conventions
+
+- **Configuration Keys (Properties):** `camelCase` (e.g., `maxLength`, `referenceFilters`)
+- **Machine Names (Data Values):** `snake_case` (e.g., `name: 'first_name'`, `object: 'project_task'`)
+
+## Contributing
+
+Do not manually edit these files. They are auto-generated from the Zod schemas in `src/`.
+
+To update schemas:
+1. Edit the corresponding `.zod.ts` file in `src/{category}/`
+2. Run `npm run gen:schema`
+3. Commit both the Zod source and generated JSON schemas
+
+---
+
+**Total Schemas:** 325 (as of latest build)
+
+For more information, see the main [README](../README.md).