feat: Add auto upload configuration and update environment settings

- Introduce AUTO_UPLOAD environment variable to enable automatic file uploads
- Update .env.example with new configuration options
- Modify docker-compose.yml to use new image and comment out default settings
- Update README.md to document AUTO_UPLOAD feature
- Implement client-side auto upload logic in index.html
- Add server-side logging for auto upload status
chore: Refactor notification message template and size unit handling

.env.example

@@ -1,14 +1,15 @@
 # Server Configuration
 PORT=3000                  # The port the server will listen on
-DUMBDROP_TITLE=DumbDrop   # Site title displayed in header (default: DumbDrop)
 
-# Upload Limits
-MAX_FILE_SIZE=1024        # Maximum file size in MB (default: 1024 MB / 1 GB)
+# Upload Settings
+MAX_FILE_SIZE=1024                # Maximum file size in MB
+AUTO_UPLOAD=false                 # Enable automatic upload on file selection
 
 # Security
-DUMBDROP_PIN=             # Optional PIN protection (4-10 digits, leave empty to disable)
+DUMBDROP_PIN=                     # Optional PIN protection (4-10 digits)
+DUMBDROP_TITLE=DumbDrop          # Site title displayed in header
 
-# Notifications
-APPRISE_URL=              # Apprise URL for notifications (leave empty to disable)
-APPRISE_MESSAGE=          # Custom message for notifications (default: "New file uploaded: {filename} ({size}), Storage used: {storage}")
-APPRISE_SIZE_UNIT=        # Size unit for notifications (B, KB, MB, GB, TB). Leave empty for auto
+# Notifications (Optional)
+APPRISE_URL=                      # Apprise URL for notifications (e.g., tgram://bottoken/ChatID)
+APPRISE_MESSAGE=New file uploaded - {filename} ({size}), Storage used {storage}
+APPRISE_SIZE_UNIT=auto           # Size unit for notifications (auto, B, KB, MB, GB, TB)