feat: Add Invoice management feature with full CRUD

[devin-ai-integration]

Summary

Adds a complete Invoice management feature following JHipster conventions. Users can create, view, edit, and delete invoices. Each invoice has a number, date, due date, amount, status (DRAFT/SENT/PAID/OVERDUE), and is linked to a bank account.

Backend (Spring Boot)

• JPA Entity: Invoice.java with fields: number, date, dueDate, amount, status (enum), ManyToOne relationship to BankAccount
• Enum: InvoiceStatus (DRAFT, SENT, PAID, OVERDUE)
• Repository: InvoiceRepository with eager loading support for bankAccount relationship
• REST Controller: InvoiceResource with full CRUD endpoints (POST, GET, PUT, PATCH, DELETE) at /api/invoices
• Liquibase: Changelog for invoice table creation with FK constraint to bank_account

Frontend (Angular)

• Model: IInvoice interface with all fields
• Service: InvoiceService with CRUD operations
• List view: Sortable table with all invoice fields and bank account link
• Detail view: Read-only view of invoice details
• Create/Edit form: Reactive form with validation, status dropdown, bank account selector
• Delete dialog: Confirmation modal
• Routing: Lazy-loaded routes with resolver
• i18n: English translations for all labels and enum values
• Navbar: Invoice added to Entities dropdown menu

Tests

• InvoiceResourceIT: Integration tests for all CRUD endpoints, validation checks, partial updates
• InvoiceTest: Entity equals/hashCode verifier
• InvoiceAsserts / InvoiceTestSamples: Test utilities

Review & Testing Checklist for Human

• Verify the Invoice entity fields and relationships match your domain requirements
• Test CRUD operations end-to-end: create an invoice, view it, edit it, delete it
• Verify bank account linking works correctly in the create/edit form
• Check that status enum values (Draft/Sent/Paid/Overdue) display correctly in list and detail views
• Run the full test suite locally: ./mvnw -ntp verify --batch-mode

Notes

• Follows existing JHipster patterns from BankAccount and Operation entities
• Uses LocalDate for date/dueDate fields (not Instant) since invoices typically need calendar dates
• Both ESLint and Checkstyle pass locally

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/e20314dd0157443cac3e5a70d2c3d572

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.