[Issue]: Per-User Service Pricing Mapping Schema

[achneerov]

Task

• Update services table schema: rename stripe_price_id to stripe_default_price_id.
• Create services_pricing_mapping table to allow per-user custom pricing for services.
• services_pricing_mapping should contain user_id (referencing auth.users.id), service_id, stripe_price_id, and quantity columns.

Acceptance Criteria

• services table has stripe_default_price_id instead of stripe_price_id.
• services_pricing_mapping table is created.
• Drizzle migration generated for these schema changes.

Checklist

• I have checked for duplicate issues.
• I have assigned the issue to the correct project board.
• I have tagged the issue properly.

Code of Conduct

• I agree to follow this project's Code of Conduct