Regenerate models from updated Vantage API spec

[orest-tokovenko-block]

Regenerated models from the latest Vantage OpenAPI spec after Vantage fixed several type issues we reported

Spec fixes (BudgetAlert)

These were the fields we specifically requested fixes for:

• duration_in_days - was string, now int | None (not required)
• user_token - now nullable
• recipient_channels - was string, now Sequence[str] | None

Other spec fixes

• Costs.total_cost - was Mapping[str, Any], now typed as CostPartial
• Costs.total_usage - was Mapping[str, Any], now Sequence[UsagePartial]
• DataExport.attributes - was str, now Mapping[str, Any]
• DataExportManifest.files - was str, now Sequence[str]
• DataExportManifest.completed_at/valid_until - now nullable
• Resource.metadata - was str, now Mapping[str, Any] | None
• ResourceCost.amount - was str, now float
• Recommendation.resources_affected_count - was str, now int
• CostReportSettings - all boolean fields now nullable
• BillingRule.apply_to_all - now nullable
• BusinessMetric.import_type - now nullable
• AttachedCostReportForBusinessMetric.cost_report_token - now nullable
• Me.default_workspace_token - now nullable
• ForecastedCostProvider - added all enum value

New models

CostPartial, UsagePartial, CostReportUrl, SendInvoice

Removed redundant overrides from common.py

These overrides existed to fix types that the spec now defines correctly:

• BudgetAlert/BudgetAlerts
• Me
• BusinessMetric/BusinessMetrics
• CostReportSettings
• Resource/Resources

Not fixed upstream

Inline settings objects (CostReport.settings, DashboardWidget.settings) are still unnamed in the spec. Vantage confirmed this is not something they can patch easily.