docs: remove POO class diagram from annex in project dossier

- Deleted the class diagram representing backend entities to simplify and declutter the annex section.

dossier-de-projet-cda.md

@@ -761,60 +761,7 @@ Je tiens à remercier l'équipe pédagogique pour son accompagnement tout au lon
 
 ### Annexe 1 - Schéma de classe POO du backend
 
-Le diagramme suivant représente les entités principales du domaine et leurs relations au sein du backend NestJS.
 
-```mermaid
-classDiagram
-    class User {
-        +UUID uuid
-        +String username
-        +String email (Encrypted)
-        +String emailHash
-        +String passwordHash
-        +String avatarUrl
-        +Enum status
-        +Boolean isTwoFactorEnabled
-        +DateTime createdAt
-        +softDelete()
-    }
-
-    class Content {
-        +UUID id
-        +UUID userId
-        +Enum type
-        +String title
-        +String slug
-        +String storageKey
-        +Int views
-        +Int usageCount
-        +DateTime createdAt
-        +incrementViews()
-    }
-
-    class Category {
-        +UUID id
-        +String name
-        +String slug
-    }
-
-    class Tag {
-        +UUID id
-        +String name
-    }
-
-    class Report {
-        +UUID id
-        +UUID contentId
-        +String reason
-        +Enum status
-        +DateTime createdAt
-    }
-
-    User "1" -- "0..*" Content : owns
-    Content "0..*" -- "1" Category : categorized_in
-    Content "0..*" -- "0..*" Tag : tagged_with
-    Content "1" -- "0..*" Report : has_reports
-```
 
 ### Annexe 2 - Sources et ressources
 - [Documentation NestJS](https://docs.nestjs.com/)