Add Category entity, edit event tabs (info/categories/stats/settings), CRUD categories

- Create Category entity: name, position (sortable), event, startAt, endAt, isActive()
- Default endAt: event.startAt - 1 day
- Add 4 tabs on edit event page: Informations, Categories/Billets, Statistiques, Parametres
- Add routes: add category, delete category, reorder categories (JSON API)
- Categories sorted by position, drag handle for future Sortable.js
- Active/Inactive badge based on date range
- Add migration for category table

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

tests/Controller/AccountControllerTest.php

@@ -567,7 +567,7 @@ class AccountControllerTest extends WebTestCase
             'is_online' => '1',
         ]);
 
-        self::assertResponseRedirects('/mon-compte?tab=events');
+        self::assertResponseRedirects('/mon-compte/evenement/'.$event->getId().'/modifier');
     }
 
     public function testEditEventDeniedForOtherUser(): void
@@ -715,7 +715,7 @@ class AccountControllerTest extends WebTestCase
             'city' => 'Paris',
         ], ['event_main_picture' => $picture]);
 
-        self::assertResponseRedirects('/mon-compte?tab=events');
+        self::assertResponseRedirects();
     }
 
     public function testEditEventWithPicture(): void
@@ -755,7 +755,7 @@ class AccountControllerTest extends WebTestCase
             'city' => 'Lyon',
         ], ['event_main_picture' => $picture]);
 
-        self::assertResponseRedirects('/mon-compte?tab=events');
+        self::assertResponseRedirects();
     }
 
     public function testEventsSearchReturnsSuccess(): void