feat(time-tracking) : add ActiveTimeEntryProvider, fixtures, and serialization groups

- ActiveTimeEntryProvider returns active timer for current user
- TimeEntry fixtures with 10 sample entries for the SIRH project
- Add time_entry:read group to Project, User, and TaskType for embedded serialization

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

src/Entity/Project.php

@@ -32,11 +32,11 @@ class Project
     #[ORM\Id]
     #[ORM\GeneratedValue]
     #[ORM\Column]
-    #[Groups(['project:read'])]
+    #[Groups(['project:read', 'time_entry:read'])]
     private ?int $id = null;
 
     #[ORM\Column(length: 255)]
-    #[Groups(['project:read', 'project:write'])]
+    #[Groups(['project:read', 'project:write', 'time_entry:read'])]
     private ?string $name = null;
 
     #[ORM\Column(type: 'text', nullable: true)]
@@ -44,7 +44,7 @@ class Project
     private ?string $description = null;
 
     #[ORM\Column(length: 7)]
-    #[Groups(['project:read', 'project:write'])]
+    #[Groups(['project:read', 'project:write', 'time_entry:read'])]
     private ?string $color = '#222783';
 
     #[ORM\ManyToOne(targetEntity: Client::class, inversedBy: 'projects')]