feat(mcp) : add clientTicket relation to time entries

Add ManyToOne relation from TimeEntry to ClientTicket entity.
MCP tools create-time-entry, update-time-entry, and list-time-entries
now support clientTicketId parameter for linking tickets to time entries.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

migrations/Version20260316124157.php

@@ -0,0 +1,35 @@
+<?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 Version20260316124157 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 time_entry ADD client_ticket_id INT DEFAULT NULL');
+        $this->addSql('ALTER TABLE time_entry ADD CONSTRAINT FK_6E537C0C9B2097DD FOREIGN KEY (client_ticket_id) REFERENCES client_ticket (id) ON DELETE SET NULL NOT DEFERRABLE');
+        $this->addSql('CREATE INDEX IDX_6E537C0C9B2097DD ON time_entry (client_ticket_id)');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE time_entry DROP CONSTRAINT FK_6E537C0C9B2097DD');
+        $this->addSql('DROP INDEX IDX_6E537C0C9B2097DD');
+        $this->addSql('ALTER TABLE time_entry DROP client_ticket_id');
+    }
+}