feat: Implement EOI document validation and orphaned data cleanup

- Add new /api/eoi/validate-document endpoint to check document existence
- Automatically clean up orphaned database records when documents don't exist in Documenso
- Update EOISection component to validate documents on mount
- Enhanced delete-generated-document endpoint to handle already-deleted documents
- Updated check-signature-status endpoint with validation logic
- Prevents EOI section from showing when document no longer exists
- Self-healing system that fixes data inconsistencies automatically

Key improvements:
- Validates document existence before showing EOI management UI
- Cleans up documensoID, signature links, and status fields when document is missing
- Graceful handling of 404 errors from Documenso API
- Background validation with user-friendly notifications
- Prevents phantom EOI states that appear generated but don't exist

components/EOISection.vue

@@ -520,6 +520,7 @@ const isDeleting = ref(false);
 const isDeletingGenerated = ref(false);
 const signatureStatus = ref<any>(null);
 const isCheckingSignatures = ref(false);
+const isValidatingDocument = ref(false);
 
 const hasGeneratedEOI = computed(() => {
   // Primary check: documensoID must exist for a generated EOI
@@ -857,10 +858,56 @@ const deleteGeneratedEOI = async () => {
   }
 };
 
+const validateDocument = async () => {
+  if (!props.interest['documensoID']) return;
+  
+  isValidatingDocument.value = true;
+  
+  try {
+    console.log('[EOI Section] Validating document for interest:', props.interest.Id);
+    
+    const response = await $fetch<{
+      success: boolean;
+      valid: boolean;
+      cleaned: boolean;
+      message: string;
+      documentStatus?: string;
+    }>('/api/eoi/validate-document', {
+      headers: {
+        'x-tag': '094ut234'
+      },
+      params: {
+        interestId: props.interest.Id.toString()
+      }
+    });
+    
+    if (response.success) {
+      if (response.cleaned) {
+        console.log('[EOI Section] Document validation cleaned up orphaned records');
+        toast.info('Detected and cleaned up orphaned EOI data');
+        emit('update'); // Refresh parent to reflect cleaned state
+      } else {
+        console.log('[EOI Section] Document validation passed');
+      }
+    }
+  } catch (error: any) {
+    console.error('[EOI Section] Failed to validate document:', error);
+    // Don't show error to user - validation is a background process
+  } finally {
+    isValidatingDocument.value = false;
+  }
+};
+
 // Check signature status on mount if EOI is generated
 onMounted(() => {
-  if (hasGeneratedEOI.value && !isEOISigned.value) {
-    checkSignatureStatus();
+  if (hasGeneratedEOI.value) {
+    // First validate the document exists
+    validateDocument().then(() => {
+      // Only check signature status if document is still valid after validation
+      if (hasGeneratedEOI.value && !isEOISigned.value) {
+        checkSignatureStatus();
+      }
+    });
   }
 });
 </script>