Added Comprehensive Invoice Management System with Routes, Controllers, and Bulk Operations

[IkkiOcean]

Description:
This PR introduces the complete invoice management system, including the schema, routes, and controllers. The system allows for efficient management of invoices within the application, with the ability to generate, update, retrieve, and delete invoices. The following updates have been made:

Schema:

The Invoice schema has been created with the following key fields:

• invoiceId: A unique identifier for the invoice.
• orderId: A reference to the related order.
• userId: A reference to the user associated with the order.
• amount: The total amount for the invoice.
• invoiceDate: The date when the invoice was generated.
• dueDate: The date by which the invoice must be paid.
• status: The payment status of the invoice (either "Paid" or "Unpaid").
• paymentId: A reference to the associated payment record, if available.

Routes and Controllers Implemented:

1. POST /generate: Generates a new invoice after payment confirmation. The invoiceId is dynamically created based on the current timestamp.
2. GET /: Retrieves invoices by filtering on parameters such as userId, orderId, and status. Supports pagination and sorting.
3. GET /:id: Fetches a specific invoice by its invoiceId.
4. PATCH /:id/status: Updates the payment status of an invoice (e.g., "Paid", "Unpaid").
5. DELETE /:id: Deletes an invoice by its invoiceId.
6. PATCH /mark-overdue: Marks invoices as overdue based on the current date and due date.
7. GET /summary: Retrieves a summary of invoices filtered by their status (e.g., "Paid", "Unpaid"), and can optionally filter by userId.
8. POST /generate-bulk: Enables the bulk generation of invoices, useful for handling multiple orders or transactions at once.

• Closes Develop Payment and Invoice Management System with Schema, Controller, and Functionality for Admin Dashboard #946

Key Features:

• Invoice Generation: Automatically assigns a unique invoiceId to each invoice and stores important data like the amount, due date, and status.
• Dynamic Filters: Flexible querying system that allows for filtering invoices by user, order, or payment status.
• Bulk Invoice Creation: Facilitates the generation of multiple invoices in a single request, ideal for businesses handling large volumes of transactions.
• Overdue Invoice Management: Automates the process of marking invoices as overdue based on their due date.

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Name	Status	Preview	Comments	Updated (UTC)
agro-tech-ai	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 9, 2024 7:38pm

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