Implement MarketplaceListing Entity

[Josue19-08]

📌 Issue: Implement MarketplaceListing Entity

🔹 Description

Define and develop the MarketplaceListing entity, managing NFTs listed for sale.

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📂 Project Structure

• Entity: src/modules/marketplace/entities/marketplace-listing.entity.ts
• Repository: src/modules/marketplace/repositories/marketplace-listing.repository.ts
• Service: src/modules/marketplace/services/marketplace-listing.service.ts
• Controller: src/modules/marketplace/controllers/marketplace-listing.controller.ts
• DTOs: src/modules/marketplace/dtos/marketplace-listing.dto.ts

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🛠️ MarketplaceListing Entity Attributes

Attribute	Data Type	Description
id	number	Unique listing identifier (Primary Key).
nftId	number	ID of the NFT being sold.
sellerId	number	ID of the user selling the NFT.
price	number	Price of the NFT in cryptocurrency.
isActive	boolean	Indicates if the listing is still available.

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📌 Tasks

• Create MarketplaceListing entity.
• Implement repository logic for listings.
• Develop marketplace listing service.
• Create controller with listing endpoints.
• Validate data in DTOs.

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✅ Acceptance Criteria

• Users should be able to list and delist NFTs.
• Listings should include seller, NFT details, and price.
• The marketplace should only show active listings.