Convert to monorepo with scoped packages

[Copilot]

Restructure repository from single package to pnpm workspace with 5 scoped packages for granular consumption.

Package Structure

• @objectstack/spec-meta - Metamodel types (ObjectEntity, ObjectField, ObjectView)
• @objectstack/spec-plugin - Plugin runtime interfaces (ObjectStackPlugin, PluginContext)
• @objectstack/spec-schemas - Zod validation schemas (ManifestSchema)
• @objectstack/spec-constants - Path conventions (PKG_CONVENTIONS)
• @objectstack/spec - Aggregator package re-exporting all sub-packages

Backward Compatibility

Existing imports remain unchanged:

// Still works
import { ObjectEntity, ManifestSchema, PKG_CONVENTIONS } from '@objectstack/spec';

// New: granular imports for smaller bundles
import { ObjectEntity } from '@objectstack/spec-meta';

Changes

• Moved source files to packages/*/src/
• Configured pnpm workspace with workspace:* dependencies
• Updated tsconfig to base configuration pattern
• Configured changesets with linked versioning for all packages
• Added files field to package.json for publish control

Original prompt

升级为多包结构

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