refactor+feat(backend): ChargeableCharConfig por ProductType + Reactivate + Delete endpoints (PRC-001)

Part A — MedioId → ProductTypeId rename across all C# layers:
  Domain, Application, Infrastructure, API, all test projects.
  Solution was non-compilable after BD refactor (5c1675e); now compiles clean (0 errors).

Part B — PATCH /api/v1/admin/chargeable-chars/{id}/reactivate:
  ReactivateChargeableCharConfigCommand/Handler, SP guard maps 50410/50411/50412
  → ChargeableCharConfigReactivationNotAllowedException(Reason) → HTTP 409.

Part C — DELETE /api/v1/admin/chargeable-chars/{id}:
  DeleteChargeableCharConfigCommand/Handler, physical DELETE on SYSTEM_VERSIONED table.
  KeyNotFoundException → 404 via ExceptionFilter.

Tests: +30 unit tests (TDD RED→GREEN). All 1266 unit tests pass.

src/api/SIGCM2.Application/Abstractions/Persistence/IChargeableCharConfigRepository.cs

@@ -7,24 +7,24 @@ namespace SIGCM2.Application.Abstractions.Persistence;
 /// Implemented by ChargeableCharConfigRepository (Dapper) in Infrastructure.
 ///
 /// InsertWithCloseAsync: invokes usp_ChargeableCharConfig_InsertWithClose which atomically
-/// closes any active row for (MedioId, Symbol) and inserts the new row.
+/// closes any active row for (ProductTypeId, Symbol) and inserts the new row.
 ///
-/// GetActiveForMedioAsync: invokes usp_ChargeableCharConfig_GetActiveForMedio which returns
-/// both per-medio rows AND global (MedioId IS NULL) rows for the given asOfDate.
-/// The Application service applies the per-medio > global priority rule.
+/// GetActiveForProductTypeAsync: invokes usp_ChargeableCharConfig_GetActiveForProductType which
+/// returns both per-ProductType rows AND global (ProductTypeId IS NULL) rows for the given asOfDate.
+/// The Application service applies the per-ProductType > global priority rule.
 /// </summary>
 public interface IChargeableCharConfigRepository
 {
     /// <summary>
     /// Invokes usp_ChargeableCharConfig_InsertWithClose inside the ambient TransactionScope.
-    /// Closes any active row matching (MedioId, Symbol) and inserts a new one.
+    /// Closes any active row matching (ProductTypeId, Symbol) and inserts a new one.
     /// Returns the Id of the newly inserted row.
     /// Throws:
     ///   - ChargeableCharConfigForwardOnlyException on SQL THROW 50409
     ///   - ChargeableCharConfigInvalidException on SQL THROW 50404 (not-found guard)
     /// </summary>
     Task<long> InsertWithCloseAsync(
-        long? medioId,
+        long? productTypeId,
         string symbol,
         string category,
         decimal price,
@@ -33,20 +33,20 @@ public interface IChargeableCharConfigRepository
 
     /// <summary>
     /// Returns all active rows whose [ValidFrom, ValidTo] window covers the given asOfDate
-    /// for the specified medio, including global rows (MedioId IS NULL).
-    /// The SP returns both per-medio AND global rows — callers apply priority.
+    /// for the specified ProductType, including global rows (ProductTypeId IS NULL).
+    /// The SP returns both per-ProductType AND global rows — callers apply priority.
     /// </summary>
-    Task<IReadOnlyList<ChargeableCharConfig>> GetActiveForMedioAsync(
-        long medioId,
+    Task<IReadOnlyList<ChargeableCharConfig>> GetActiveForProductTypeAsync(
+        long productTypeId,
         DateOnly asOfDate,
         CancellationToken ct = default);
 
     /// <summary>
-    /// Returns paginated rows filtered by MedioId and IsActive.
+    /// Returns paginated rows filtered by ProductTypeId and IsActive.
     /// Skip = (page - 1) * pageSize computed by the caller.
     /// </summary>
     Task<IReadOnlyList<ChargeableCharConfig>> ListAsync(
-        long? medioId,
+        long? productTypeId,
         bool activeOnly,
         int skip,
         int take,
@@ -56,7 +56,7 @@ public interface IChargeableCharConfigRepository
     /// Returns total row count for the given filters (used for pagination metadata).
     /// </summary>
     Task<int> CountAsync(
-        long? medioId,
+        long? productTypeId,
         bool activeOnly,
         CancellationToken ct = default);
 
@@ -76,4 +76,29 @@ public interface IChargeableCharConfigRepository
         long id,
         DateOnly today,
         CancellationToken ct = default);
+
+    /// <summary>
+    /// Invokes usp_ChargeableCharConfig_ReactivateWithGuard.
+    /// Guard rules (enforced by SP):
+    ///   50410 → target row is already active → ChargeableCharConfigReactivationNotAllowedException(ALREADY_ACTIVE)
+    ///   50411 → a vigente active row exists for (ProductTypeId, Symbol) → ChargeableCharConfigReactivationNotAllowedException(VIGENTE_EXISTS)
+    ///   50412 → posterior rows exist after target row → ChargeableCharConfigReactivationNotAllowedException(POSTERIOR_ROWS_EXIST)
+    ///   50404 → row not found → ChargeableCharConfigInvalidException
+    /// On success: re-opens the row (IsActive=true, ValidTo=NULL) and returns the reactivated entity.
+    /// </summary>
+    Task<ChargeableCharConfig> ReactivateAsync(
+        long id,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Physically deletes the row with the given Id from dbo.ChargeableCharConfig (current state).
+    /// NOTE: Since SYSTEM_VERSIONING is ON, SQL Server moves the row to the history table with
+    /// SysEndTime set to the delete time. The row disappears from all current-state queries but
+    /// remains queryable via FOR SYSTEM_TIME. Temporal audit trail is preserved.
+    /// Future guard for "used in invoicing" is deferred to FAC-001 followup issue.
+    /// Throws KeyNotFoundException if the row does not exist.
+    /// </summary>
+    Task DeleteAsync(
+        long id,
+        CancellationToken ct = default);
 }