fix config on submit not updated, fix startup initial always in ap mode

rust/src/hal/v4_hal.rs

@@ -543,4 +543,10 @@ impl<'a> BoardInteraction<'a> for V4<'a> {
         self.esp.delay.delay_ms(10);
         anyhow::Ok(())
     }
+
+    fn set_config(&mut self, config: PlantControllerConfig) -> anyhow::Result<()> {
+        self.config = config;
+        self.esp.save_config(&self.config)?;
+        anyhow::Ok(())
+    }
 }