Add AI model pricing, Bedrock provider, and InferenceProvider/ModelFamily split (#18155)

## Summary

- **Model pricing overhaul**: All model constants updated with accurate
pricing in dollars per 1M tokens, including cached input rates, cache
creation rates, and tiered >200k context pricing
- **New providers**: Added Google (Gemini 3.x), Mistral, and AWS Bedrock
as inference providers. Bedrock serves Claude Opus 4.6 and Sonnet 4.6
via AWS, with proper credential handling following the existing S3/SES
pattern
- **InferenceProvider/ModelFamily split**: Refactored `ModelProvider`
into two orthogonal enums — `InferenceProvider` (who serves the model:
auth, SDK, metadata format) and `ModelFamily` (who created it: token
counting semantics). This eliminates growing `||` chains for token
normalization checks like `excludesCachedTokens`
- **Billing improvements**: Reasoning tokens charged at output rate,
cache token discounts applied accurately, real errors thrown to Sentry
on billing failures

## Test plan

- [x] All existing unit tests updated and passing (23 tests across 3
test files)
- [x] Lint passes for both twenty-server and twenty-front
- [ ] CI checks pass


Made with [Cursor](https://cursor.com)

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/twenty-server/src/modules/workflow/workflow-executor/workflow-actions/ai-agent/ai-agent.workflow-action.ts

@@ -78,8 +78,8 @@ export class AiAgentWorkflowAction implements WorkflowAction {
       const executionContext =
         await this.workflowExecutionContextService.getExecutionContext(runInfo);
 
-      const { result, usage } = await this.aiAgentExecutionService.executeAgent(
-        {
+      const { result, usage, cacheCreationTokens } =
+        await this.aiAgentExecutionService.executeAgent({
           agent,
           userPrompt: resolveInput(prompt, context) as string,
           actorContext: executionContext.isActingOnBehalfOfUser
@@ -87,12 +87,11 @@ export class AiAgentWorkflowAction implements WorkflowAction {
             : undefined,
           rolePermissionConfig: executionContext.rolePermissionConfig,
           authContext: executionContext.authContext,
-        },
-      );
+        });
 
       await this.aiBillingService.calculateAndBillUsage(
         agent?.modelId ?? DEFAULT_SMART_MODEL,
-        usage,
+        { usage, cacheCreationTokens },
         workspaceId,
         agent?.id || null,
       );