Fix email system error handling and remove hardcoded credentials

- Handle missing email sessions gracefully without throwing errors
- Clear partial session data when no valid session exists
- Return empty results instead of 401 errors for missing credentials
- Remove hardcoded Documenso API key and require env variables
- Reduce email fetch limit from 50 to 20 for performance
- Add documentation for email system fixes

server/api/email/fetch-thread.ts

@@ -36,10 +36,12 @@ export default defineEventHandler(async (event) => {
     // Get encrypted credentials from session
     const encryptedCredentials = getCredentialsFromSession(sessionId);
     if (!encryptedCredentials) {
-      throw createError({ 
-        statusCode: 401, 
-        statusMessage: "Email credentials not found. Please reconnect." 
-      });
+      // Return empty results instead of throwing error
+      return { 
+        success: true, 
+        emails: [],
+        threads: []
+      };
     }
 
     // Decrypt credentials

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

@@ -80,10 +80,17 @@ export default defineEventHandler(async (event) => {
     const berthNumbers = berths.map(b => b['Mooring Number']).join(', ');
 
     // Documenso API configuration
-    const documensoApiKey = process.env.NUXT_DOCUMENSO_API_KEY || 'api_malptg62zqyb0wrp';
-    const documensoBaseUrl = process.env.NUXT_DOCUMENSO_BASE_URL || 'https://signatures.portnimara.dev';
+    const documensoApiKey = process.env.NUXT_DOCUMENSO_API_KEY;
+    const documensoBaseUrl = process.env.NUXT_DOCUMENSO_BASE_URL;
     const templateId = '9';
 
+    if (!documensoApiKey || !documensoBaseUrl) {
+      throw createError({ 
+        statusCode: 500, 
+        statusMessage: "Documenso configuration missing. Please check NUXT_DOCUMENSO_API_KEY and NUXT_DOCUMENSO_BASE_URL environment variables." 
+      });
+    }
+
     // 1. Get template (optional - just to verify it exists)
     try {
       const templateResponse = await fetch(`${documensoBaseUrl}/api/v1/templates/${templateId}`, {