refactor(shell): Improve shell command naming and output formatting

- Renamed shell commands in  and  to be shorter
  and remove underscores (e.g.,  to ).
- Consolidated get functions into a single show command for both valve
  and Modbus settings (e.g., , ).
- Adjusted output formatting for show commands to be right-aligned and
  remove horizontal lines for better readability.
- Fixed missing getter function implementations in  and their
  declarations in .
- Ensured  is correctly selected in
  to make valve shell commands available.

software/lib/shell_valve/Kconfig

@@ -1,6 +1,7 @@
 config SHELL_VALVE
 	bool "Shell Valve commands"
-	default y
-	depends on SHELL
-	help
-	  Enable the shell commands for valve control.
+    default n
+    depends on SHELL
+    depends on LIB_VALVE
+    help
+      Enable the valve shell commands.