Implement pump flow monitoring and UI normalization enhancements

- Rust: Add `MIN_PUMP_FLOW_ML` constant and logging for insufficient pump flow with fault handling.
- UI: Normalize config fields to maintain consistency and prevent false dirty flags after round-trips.
- KiCad: Update board zone settings for `PlantCtrlESP32` and `MPPT`.
- IntelliJ: Add `.idea` configurations for project setup and inspections.

Software/MainBoard/rust/src_webpack/src/api.ts

@@ -36,10 +36,10 @@ export interface BackupHeader {
 
 export interface NetworkConfig {
     ap_ssid: string,
-    ssid: string,
-    password: string,
-    mqtt_url: string,
-    base_topic: string,
+    ssid: string | null,
+    password: string | null,
+    mqtt_url: string | null,
+    base_topic: string | null,
     mqtt_user: string | null,
     mqtt_password: string | null,
     max_wait: number