feat : add Project entity with CRUD API and Client relation

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

migrations/Version20260309213906.php

@@ -0,0 +1,34 @@
+<?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 Version20260309213906 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('CREATE TABLE project (id INT GENERATED BY DEFAULT AS IDENTITY NOT NULL, name VARCHAR(255) NOT NULL, description TEXT DEFAULT NULL, color VARCHAR(7) NOT NULL, client_id INT DEFAULT NULL, PRIMARY KEY (id))');
+        $this->addSql('CREATE INDEX IDX_2FB3D0EE19EB6921 ON project (client_id)');
+        $this->addSql('ALTER TABLE project ADD CONSTRAINT FK_2FB3D0EE19EB6921 FOREIGN KEY (client_id) REFERENCES client (id) ON DELETE SET NULL NOT DEFERRABLE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE project DROP CONSTRAINT FK_2FB3D0EE19EB6921');
+        $this->addSql('DROP TABLE project');
+    }
+}