Update project structure and configurations

crates/solver/src/coupling.rs

@@ -30,10 +30,13 @@ use std::collections::HashMap;
 /// Heat flows from `hot_circuit` to `cold_circuit` proportional to the
 /// temperature difference and thermal conductance (UA value).
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
 pub struct ThermalCoupling {
     /// Circuit that supplies heat (higher temperature side).
+    #[serde(alias = "hot_circuit")]
     pub hot_circuit: CircuitId,
     /// Circuit that receives heat (lower temperature side).
+    #[serde(alias = "cold_circuit")]
     pub cold_circuit: CircuitId,
     /// Thermal conductance (UA) in W/K. Higher values = more heat transfer.
     pub ua: ThermalConductance,