feat(application): commands/queries + IChargeableCharConfigService (PRC-001)

src/api/SIGCM2.Application/Pricing/ChargeableChars/Create/CreateChargeableCharConfigResponse.cs

@@ -0,0 +1,10 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.Create;
+
+/// <summary>
+/// PRC-001 — Response for CreateChargeableCharConfigCommand.
+/// </summary>
+public sealed record CreateChargeableCharConfigResponse(
+    long Id,
+    string Symbol,
+    decimal PricePerUnit,
+    DateOnly ValidFrom);