fix: Add ALLOWED_EXTENSIONS config for file uploads

- Added ALLOWED_EXTENSIONS setting to core config
- Supports PDF, images, documents, and archives
- Fixes supplier invoice upload validation error
- Added configuration to .env.example

.env.example

@@ -89,4 +89,6 @@ EMAIL_AUTO_CLASSIFY=false
 EMAIL_AI_CONFIDENCE_THRESHOLD=0.7
 EMAIL_MAX_FETCH_PER_RUN=50
 EMAIL_PROCESS_INTERVAL_MINUTES=5
-EMAIL_WORKFLOWS_ENABLED=true
+EMAIL_WORKFLOWS_ENABLED=true
+EMAIL_MAX_UPLOAD_SIZE_MB=50
+ALLOWED_EXTENSIONS=.pdf,.jpg,.jpeg,.png,.gif,.doc,.docx,.xls,.xlsx,.zip

app/core/config.py

@@ -70,6 +70,7 @@ class Settings(BaseSettings):
     EMAIL_PROCESS_INTERVAL_MINUTES: int = 5
     EMAIL_WORKFLOWS_ENABLED: bool = True
     EMAIL_MAX_UPLOAD_SIZE_MB: int = 50  # Max file size for email uploads
+    ALLOWED_EXTENSIONS: List[str] = [".pdf", ".jpg", ".jpeg", ".png", ".gif", ".doc", ".docx", ".xls", ".xlsx", ".zip"]  # Allowed file extensions for uploads
     
     # vTiger Cloud Integration
     VTIGER_ENABLED: bool = False