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/stripe.ts

@@ -6,7 +6,7 @@ import type Stripe from 'stripe'
 import {
   webhookResponses,
   findPaymentByProviderId,
-  updatePaymentFromWebhook,
+  updatePaymentStatus,
   updateInvoiceOnPaymentSuccess,
   handleWebhookError,
   logWebhookEvent
@@ -117,14 +117,12 @@ export const stripeProvider = (stripeConfig: StripeProviderConfig) => {
                     timestamp: new Date().toISOString(),
                     provider: 'stripe'
                   }
-                  const updateSuccess = await updatePaymentFromWebhook(
+                  const updateSuccess = await updatePaymentStatus(
                     payload,
                     payment.id,
                     status,
                     providerData,
-                    pluginConfig,
-                    'stripe',
-                    event.type
+                    pluginConfig
                   )
 
                   // If payment is successful and update succeeded, update the invoice
@@ -165,14 +163,12 @@ export const stripeProvider = (stripeConfig: StripeProviderConfig) => {
                       timestamp: new Date().toISOString(),
                       provider: 'stripe'
                     }
-                    const updateSuccess = await updatePaymentFromWebhook(
+                    const updateSuccess = await updatePaymentStatus(
                       payload,
                       payment.id,
                       isFullyRefunded ? 'refunded' : 'partially_refunded',
                       providerData,
-                      pluginConfig,
-                      'stripe',
-                      event.type
+                      pluginConfig
                     )
 
                     if (!updateSuccess) {