feat: Implement license and tenant management APIs

- Added endpoints for license management including creation, retrieval, update, validation, and usage tracking.
- Developed service layer for business logic related to licenses.
- Introduced tenant management APIs for creating, updating, listing, and deleting tenants.
- Implemented user-tenant relationship management with endpoints for adding, removing, and updating user roles in tenants.
- Created DTOs for data transfer between layers and models for ORM mapping.
- Enhanced logging and error handling across services.

backend/api/v1/common/base_models.py

@@ -20,7 +20,7 @@ class TimestampMixin:
 class TenantScopedMixin:
     """Mixin for tenant and company scoped entities"""
 
-    tenant_id: Mapped[int] = mapped_column(Integer, ForeignKey("a76.tenants.id"), nullable=False, index=True)
+    tenant_id: Mapped[int] = mapped_column(Integer, ForeignKey("core.tenants.id"), nullable=False, index=True)
     company_id: Mapped[int] = mapped_column(Integer, ForeignKey("a76.company.id"), nullable=False, index=True)