add ability to override frequency per plant and adjust timezone, fix missing workhour for plants

rust/src/config.rs

@@ -79,6 +79,7 @@ pub struct PlantControllerConfig {
     pub tank: TankConfig,
     pub night_lamp: NightLampConfig,
     pub plants: [PlantConfig; PLANT_COUNT],
+    pub timezone: Option<String>,
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
@@ -93,7 +94,10 @@ pub struct PlantConfig {
     pub sensor_a: bool,
     pub sensor_b: bool,
     pub max_consecutive_pump_count: u8,
+    pub moisture_sensor_min_frequency: Option<f32>, // Optional min frequency
+    pub moisture_sensor_max_frequency: Option<f32>, // Optional max frequency
 }
+
 impl Default for PlantConfig {
     fn default() -> Self {
         Self {
@@ -106,6 +110,8 @@ impl Default for PlantConfig {
             sensor_a: true,
             sensor_b: false,
             max_consecutive_pump_count: 10,
+            moisture_sensor_min_frequency: None, // No override by default
+            moisture_sensor_max_frequency: None, // No override by default
         }
     }
-}
+}