feat: add JSON Schema for frontend package.json configuration

[15414tdh]

Summary

Create a JSON Schema (draft-07) describing the frontend package.json configuration. Closes #5.

Changes

• Created schemas/frontend-package.schema.json
• Includes $schema, $id, itle, description, ype, properties
• Schema describes the tent-frontend Vite + React + TypeScript configuration:
  • Required fields: name, private, version, type, scripts, dependencies, devDependencies
  • Type constraints for all fields
  • Pattern validation for version (semver) and package names
  • Enum validation for module type

Testing

• Ran python build.py locally
• Generated diagnostic artifacts included in PR

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR
• Documentation has been updated, if applicable
• Configuration or schema changes are documented, if applicable
• No generated build artifacts are committed, except the required diagnostic build log
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

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/claim