Closes #9703 /claim #9703

Summary

Implemented Oracle Fusion Cloud ERP piece with:

• OAuth2 Authentication (client credentials flow)
• Get Employee - Retrieve worker information by ID
• Create Payables Invoice - Create new invoices with supplier, amount, date, currency
• Get Purchase Order - Retrieve PO information by ID
• Custom API Call - Flexible endpoint access

Files Added (11)

• package.json - NPM package definition
• project.json - NX workspace configuration
• tsconfig.json / tsconfig.lib.json - TypeScript configs
• README.md - Documentation
• src/index.ts - Main piece + auth definition
• src/lib/auth.ts - OAuth2 token helper
• src/lib/common.ts - API call wrapper
• src/lib/actions/*.ts - 3 action implementations

Test Plan

• Verify piece appears in UI
• Test OAuth2 authentication flow
• Test each action with Oracle Fusion sandbox