Add RC values, update docs, rename manpage

docs/DETAILS.md

@@ -188,5 +188,7 @@ Software Version     : v25.3.2
 - **Permission issues**: Verify SSH key permissions (600) and output directory access
 
 ### Exit Codes
-- `0`: Success
-- `1`: Configuration error, authentication failure, or connection issues
+- `0`: Success (all devices processed successfully)
+- `1`: Configuration error, authentication failure, or connection issues
+- `10`: Some devices failed
+- `11`: All devices failed

docs/ipng-router-backup.1

@@ -98,10 +98,16 @@ Example configuration file
 .SH EXIT STATUS
 .TP
 .B 0
-Success
+Success (all devices processed successfully)
 .TP
 .B 1
 General error (configuration file not found, authentication failure, etc.)
+.TP
+.B 10
+Some devices failed
+.TP
+.B 11
+All devices failed
 .SH AUTHOR
 Written by Pim van Pelt.
 .SH REPORTING BUGS