feat(Task): implement user ownership for tasks and enhance related services

- Added ownerId field to Task model to associate tasks with users.
- Updated TaskService methods to enforce user ownership in task operations.
- Enhanced API routes to include user authentication and ownership checks.
- Modified DailyService and analytics services to filter tasks by user.
- Integrated user session handling in various components for personalized task management.

prisma/schema.prisma

@@ -23,6 +23,7 @@ model User {
   preferences     UserPreferences?
   notes           Note[]
   dailyCheckboxes DailyCheckbox[]
+  tasks           Task[]           @relation("TaskOwner")
 
   @@map("users")
 }
@@ -41,7 +42,9 @@ model Task {
   updatedAt        DateTime        @updatedAt
   jiraProject      String?
   jiraKey          String?
-  assignee         String?
+  assignee         String?         // Legacy field - keep for Jira/TFS compatibility
+  ownerId          String          // Required - chaque tâche appartient à un user
+  owner            User            @relation("TaskOwner", fields: [ownerId], references: [id], onDelete: Cascade)
   jiraType         String?
   tfsProject       String?
   tfsPullRequestId Int?