feat(valve): Implement obstacle detection with configurable thresholds

Introduces separate configurable current thresholds for obstacle detection
during valve opening and closing movements.

- Added  state to .
- Added  and
   to .
- Modified  to implement obstacle detection in ,
  setting  on high current, and to load/save
  these new thresholds via settings.
- Added new setter/getter functions for obstacle thresholds to  and .
- Updated  with new shell commands (, )
  and updated  to display these settings.
- Updated  to document the new registers and error states.
- Updated  to include new register definitions, menu options,
  and display of obstacle current thresholds.

software/include/lib/modbus_server.h

@@ -89,9 +89,21 @@ enum {
 	 */
 	REG_HOLDING_MAX_CLOSING_TIME_S = 0x0002,
 	/**
-	 * @brief Minimum current threshold in mA for end-position detection.
+	 * @brief Minimum current threshold in mA for end-position detection during opening.
 	 */
-	REG_HOLDING_VALVE_END_CURRENT_THRESHOLD_MA = 0x0003,
+	REG_HOLDING_END_CURRENT_THRESHOLD_OPEN_MA = 0x0003,
+	/**
+	 * @brief Minimum current threshold in mA for end-position detection during closing.
+	 */
+	REG_HOLDING_END_CURRENT_THRESHOLD_CLOSE_MA = 0x0004,
+	/**
+	 * @brief Obstacle current threshold in mA for opening.
+	 */
+	REG_HOLDING_OBSTACLE_CURRENT_THRESHOLD_OPEN_MA = 0x0005,
+	/**
+	 * @brief Obstacle current threshold in mA for closing.
+	 */
+	REG_HOLDING_OBSTACLE_CURRENT_THRESHOLD_CLOSE_MA = 0x0006,
 	/**
 	 * @brief Bitmask for reading and writing digital outputs. Bit 0: Output 1,
 	 * Bit 1: Output 2. 1=ON, 0=OFF.

software/include/lib/valve.h

@@ -32,7 +32,8 @@ enum valve_movement {
 	VALVE_MOVEMENT_IDLE, /**< The valve is not moving. */
 	VALVE_MOVEMENT_OPENING, /**< The valve is currently opening. */
 	VALVE_MOVEMENT_CLOSING, /**< The valve is currently closing. */
-	VALVE_MOVEMENT_ERROR /**< An error occurred during movement. */
+	VALVE_MOVEMENT_ERROR, /**< An error occurred during movement. */
+	VALVE_MOVEMENT_OBSTACLE /**< An obstacle was detected during movement. */
 };
 
 /**
@@ -113,6 +114,20 @@ void valve_set_end_current_threshold_open(uint16_t current_ma);
  */
 void valve_set_end_current_threshold_close(uint16_t current_ma);
 
+/**
+ * @brief Sets the current threshold for obstacle detection during opening.
+ *
+ * @param current_ma The current threshold in milliamps.
+ */
+void valve_set_obstacle_current_threshold_open(uint16_t current_ma);
+
+/**
+ * @brief Sets the current threshold for obstacle detection during closing.
+ *
+ * @param current_ma The current threshold in milliamps.
+ */
+void valve_set_obstacle_current_threshold_close(uint16_t current_ma);
+
 /**
  * @brief Gets the current threshold for end-position detection during opening.
  *
@@ -141,6 +156,20 @@ uint16_t valve_get_max_open_time(void);
  */
 uint16_t valve_get_max_close_time(void);
 
+/**
+ * @brief Gets the current threshold for obstacle detection during opening.
+ *
+ * @return The current threshold in milliamps.
+ */
+uint16_t valve_get_obstacle_current_threshold_open(void);
+
+/**
+ * @brief Gets the current threshold for obstacle detection during closing.
+ *
+ * @return The current threshold in milliamps.
+ */
+uint16_t valve_get_obstacle_current_threshold_close(void);
+
 /**
  * @brief Gets the current drawn by the valve motor during opening.
  *