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>

src/Entity/TimeEntry.php

@@ -85,6 +85,11 @@ class TimeEntry
     #[Groups(['time_entry:read', 'time_entry:write'])]
     private ?Task $task = null;
 
+    #[ORM\ManyToOne(targetEntity: ClientTicket::class)]
+    #[ORM\JoinColumn(nullable: true, onDelete: 'SET NULL')]
+    #[Groups(['time_entry:read', 'time_entry:write'])]
+    private ?ClientTicket $clientTicket = null;
+
     /** @var Collection<int, TaskTag> */
     #[ORM\ManyToMany(targetEntity: TaskTag::class)]
     #[ORM\JoinTable(
@@ -189,6 +194,18 @@ class TimeEntry
         return $this;
     }
 
+    public function getClientTicket(): ?ClientTicket
+    {
+        return $this->clientTicket;
+    }
+
+    public function setClientTicket(?ClientTicket $clientTicket): static
+    {
+        $this->clientTicket = $clientTicket;
+
+        return $this;
+    }
+
     /** @return Collection<int, TaskTag> */
     public function getTags(): Collection
     {