Completely remove all race condition and optimistic locking logic

- Remove webhook context tracking system (context.ts file)
- Eliminate updatePaymentFromWebhook wrapper function
- Simplify payment providers to use updatePaymentStatus directly
- Remove all version-based optimistic locking references
- Clean up webhook context parameters and metadata
- Streamline codebase assuming providers don't send duplicate webhooks

The payment system now operates with simple, direct updates without any
race condition handling, as payment providers typically don't send
duplicate webhook requests for the same event.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/providers/utils.ts

@@ -4,7 +4,6 @@ import type { BillingPluginConfig } from '@/plugin/config'
 import type { ProviderData } from './types'
 import { defaults } from '@/plugin/config'
 import { extractSlug, toPayloadId } from '@/plugin/utils'
-import { markRequestAsWebhook } from './context'
 
 /**
  * Common webhook response utilities
@@ -44,29 +43,6 @@ export async function findPaymentByProviderId(
   return payments.docs.length > 0 ? payments.docs[0] as Payment : null
 }
 
-/**
- * Update payment status from webhook with proper context tracking
- */
-export async function updatePaymentFromWebhook(
-  payload: Payload,
-  paymentId: string | number,
-  status: Payment['status'],
-  providerData: ProviderData<any>,
-  pluginConfig: BillingPluginConfig,
-  provider: string,
-  eventType?: string
-): Promise<boolean> {
-  // Mark the request context as webhook before updating with metadata
-  markRequestAsWebhook((payload as any).req, provider, 'payment_status_update', {
-    paymentId: paymentId.toString(),
-    newStatus: status,
-    eventType,
-    timestamp: new Date().toISOString()
-  })
-
-  return updatePaymentStatus(payload, paymentId, status, providerData, pluginConfig)
-}
-
 /**
  * Update payment status and provider data
  */