feat : étape 1/5 - ajout des champs sex et exitedAt sur Bovine

- Migration pour les nouvelles colonnes
- ExistsFilter sur exitedAt, SearchFilter sur sex/workNumber/breedCode, DateFilter sur birthDate
- DTO front étendu avec workNumber, birthDate, breedCode, sex, exitedAt

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

migrations/Version20260422155300.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20260422155300 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE bovine ADD sex VARCHAR(1) DEFAULT NULL');
+        $this->addSql('ALTER TABLE bovine ADD exited_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE bovine DROP sex');
+        $this->addSql('ALTER TABLE bovine DROP exited_at');
+    }
+}