fix: prevent deleting registry entries that would create sequence gaps

Only the last entry in a company+year sequence can be deleted. Trying
to delete an earlier number (e.g. #2 when #3 exists) returns a 409
error with a Romanian message explaining the restriction.

Also routes UI deletes through the API (like create/update) so they
get proper audit logging and sequence recalculation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/modules/registratura/components/registratura-module.tsx

@@ -216,7 +216,12 @@ export function RegistraturaModule() {
   };
 
   const handleDelete = async (id: string) => {
-    await removeEntry(id);
+    try {
+      await removeEntry(id);
+    } catch (err) {
+      const msg = err instanceof Error ? err.message : "Eroare la ștergere";
+      alert(msg);
+    }
   };
 
   /** All closes go through the close dialog */

src/modules/registratura/hooks/use-registry.ts

@@ -15,7 +15,6 @@ import {
   getAllEntries,
   getFullEntry,
   saveEntry,
-  deleteEntry,
 } from "../services/registry-service";
 import type { RegistryAuditEvent } from "../types";
 import {
@@ -111,10 +110,19 @@ export function useRegistry() {
 
   const removeEntry = useCallback(
     async (id: string) => {
-      await deleteEntry(storage, blobStorage, id);
+      // Use the API for sequence validation + audit logging
+      const res = await fetch(`/api/registratura?id=${encodeURIComponent(id)}`, {
+        method: "DELETE",
+      });
+      const result = await res.json();
+
+      if (!result.success) {
+        throw new Error(result.error ?? "Failed to delete entry");
+      }
+
       await refresh();
     },
-    [storage, blobStorage, refresh],
+    [refresh],
   );
 
   const closeEntry = useCallback(