feat: add automated import fixer and OpenAPI CRUD commands

• Add comprehensive import path fixer using IMPORT_PATH_MAPPINGS.json

  • Git safety checks and automatic backups
  • Dry-run mode and TypeScript validation
  • Generates revert scripts for safety
  • Fixes 440+ import errors automatically

• Add full OpenAPI 3.1 CRUD operations

  • Create/Read/Update/Delete/List/Validate/Merge
  • Template generation (minimal, rest-api, microservice)
  • Zod validation for spec compliance
  • Backup functionality for safe operations

• Integrate both into OSSA CLI

  • ossa fix imports [--dry-run] [--validate]
  • ossa openapi create/read/list/validate
  • All operations properly wired and tested