Feat(Assinatura): migracao dos modelos de PDF-alvo e dedupe AB#1473

Gerada por makemigrations no container padrao de teste — duas tabelas novas
no app isolado, nenhuma alteracao em tabela do core.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

sapl/integracao_hub/migrations/0003_assinaturarecebida_documentoparaassinatura.py

@@ -0,0 +1,45 @@
+# Generated by Django 2.2.28 on 2026-08-20 17:26
+
+from django.db import migrations, models
+import django.db.models.deletion
+import sapl.integracao_hub.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('materia', '0094_add_anexoproposicao'),
+        ('integracao_hub', '0002_anexoproposicao'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='DocumentoParaAssinatura',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('arquivo', models.FileField(upload_to=sapl.integracao_hub.models._caminho_pdf_alvo, verbose_name='PDF-alvo da assinatura')),
+                ('hash_sha256', models.CharField(max_length=64, verbose_name='SHA-256 do PDF-alvo')),
+                ('hash_origem', models.CharField(max_length=64, verbose_name='SHA-256 do texto_original usado na geração')),
+                ('gerado_em', models.DateTimeField(auto_now=True, verbose_name='Gerado em')),
+                ('materia', models.OneToOneField(on_delete=django.db.models.deletion.PROTECT, related_name='documento_para_assinatura', to='materia.MateriaLegislativa', verbose_name='Matéria Legislativa')),
+            ],
+            options={
+                'verbose_name': 'Documento para Assinatura',
+                'verbose_name_plural': 'Documentos para Assinatura',
+            },
+        ),
+        migrations.CreateModel(
+            name='AssinaturaRecebida',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('chave_idempotencia', models.UUIDField(unique=True, verbose_name='Chave de Idempotência')),
+                ('hash_assinado', models.CharField(max_length=64, verbose_name='SHA-256 do PDF assinado recebido')),
+                ('recebido_em', models.DateTimeField(auto_now_add=True, verbose_name='Recebido em')),
+                ('materia', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='+', to='materia.MateriaLegislativa', verbose_name='Matéria Legislativa')),
+            ],
+            options={
+                'verbose_name': 'Assinatura Recebida do Hub',
+                'verbose_name_plural': 'Assinaturas Recebidas do Hub',
+            },
+        ),
+    ]