feat: add condition and seller address to product model

[SebasHidalgo]

📝 Add condition and seller address to product model

🛠️ Issue

• Closes [FEAT]: Add condition field and sellerAddress relation to Product model #245

📖 Description

• Updated the Product model by adding a condition field and linking products to sellers through a sellerAddress relation. Adjusted related DTOs, services, resolver, seed data, and tests to support the new fields. Also generated a Prisma migration for these changes.

✅ Changes made

• Created the migration file in apps/backend/prisma/migrations.
• Updated the prisma schema in apps/backend/prisma/schema.prisma.
• Updated the seed.ts file in apps/backend/prisma/seed.ts.
• Updated the create-product.input.ts and product.dto.ts files in apps/backend/src/modules/product/dto.
• Updated the product.entity.ts file in apps/backend/src/modules/product/entities.
• Updated the product.resolver.spec.ts and product.service.spec.ts files in apps/backend/src/modules/product

🖼️ Media (screenshots/videos)

Demo.mp4

[derianrddev]

@SebasHidalgo Please resolve the merge conflicts

[derianrddev]

LGTM! Thank you very much!