perf: set global prisma transaction timeouts and reduce transaction scope (#2607)

Configure default transaction options (5s maxWait, 10s timeout) on the
PrismaClient instead of per-transaction overrides. Move side effects
like email sending, webhook triggers, and job dispatches out of
$transaction blocks to avoid holding database connections open during
network I/O.

Also extracts the direct template email into a background job and fixes
a bug where prisma was used instead of tx inside a transaction.

packages/lib/server-only/envelope/create-envelope.ts

@@ -582,7 +582,7 @@ export const createEnvelope = async ({
       });
     }
 
-    // Only create audit logs and webhook events for documents.
+    // Only create audit logs for documents.
     if (type === EnvelopeType.DOCUMENT) {
       await tx.documentAuditLog.create({
         data: createDocumentAuditLogData({
@@ -619,17 +619,21 @@ export const createEnvelope = async ({
           }),
         });
       }
-
-      await triggerWebhook({
-        event: WebhookTriggerEvents.DOCUMENT_CREATED,
-        data: ZWebhookDocumentSchema.parse(mapEnvelopeToWebhookDocumentPayload(createdEnvelope)),
-        userId,
-        teamId,
-      });
     }
 
     return createdEnvelope;
   });
 
+  // Trigger webhook outside the transaction to avoid holding the connection
+  // open during network I/O.
+  if (type === EnvelopeType.DOCUMENT) {
+    await triggerWebhook({
+      event: WebhookTriggerEvents.DOCUMENT_CREATED,
+      data: ZWebhookDocumentSchema.parse(mapEnvelopeToWebhookDocumentPayload(createdEnvelope)),
+      userId,
+      teamId,
+    });
+  }
+
   return createdEnvelope;
 };