Implement Weaviate integration for product add/delete operations

[KoderFPV]

Description

Add and remove products from the vector database when they are created or deleted in the main database. Product creation must be atomic - if the vector database fails, the product should not be created at all.

Acceptance Criteria

• Products are automatically added to vector database when created
• Products are automatically removed from vector database when deleted
• Product creation fails completely if vector database is unavailable
• Product deletion rolls back if vector database operation fails
• Models remain independent with no circular dependencies
• All error messages are translated based on user locale
• Service layer coordinates operations between databases
• API routes use service layer instead of calling databases directly
• Sync failures are logged for debugging
• Unit tests cover model operations
• Integration tests verify coordination between databases

🤖 Generated with Claude Code