Add embedded signing support with webhook configuration

- Add helper function to generate embedded signing URLs from Documenso links
- Store embedded signature links for all signers (Client, Developer, CC)
- Add webhook secret configuration for embedded signing
- Add documentation for embedded signing and website implementation
- Update Interest type with embedded signature link fields

server/api/email/generate-eoi-document.ts

@@ -1,5 +1,12 @@
 import { getInterestById, updateInterest } from '~/server/utils/nocodb';
 
+// Helper function to create embedded signing URLs
+const createEmbeddedSigningUrl = (documensoUrl: string, signerType: 'client' | 'cc' | 'developer'): string => {
+  if (!documensoUrl) return '';
+  const token = documensoUrl.split('/').pop();
+  return `https://portnimara.com/sign/${signerType}/${token}`;
+};
+
 interface DocumensoRecipient {
   id: number;
   name: string;
@@ -323,12 +330,15 @@ export default defineEventHandler(async (event) => {
     // Add signing links to update data with new column names
     if (signingLinks['Client']) {
       updateData['Signature Link Client'] = signingLinks['Client'];
+      updateData['EmbeddedSignatureLinkClient'] = createEmbeddedSigningUrl(signingLinks['Client'], 'client');
     }
     if (signingLinks['David Mizrahi']) {
       updateData['Signature Link Developer'] = signingLinks['David Mizrahi'];
+      updateData['EmbeddedSignatureLinkDeveloper'] = createEmbeddedSigningUrl(signingLinks['David Mizrahi'], 'developer');
     }
     if (signingLinks['Oscar Faragher']) {
       updateData['Signature Link CC'] = signingLinks['Oscar Faragher'];
+      updateData['EmbeddedSignatureLinkCC'] = createEmbeddedSigningUrl(signingLinks['Oscar Faragher'], 'cc');
     }
 
     await updateInterest(interestId, updateData);