feat(Tags): implement user-specific tag management and enhance related services

- Added ownerId field to Tag model to associate tags with users.
- Updated tagsService methods to enforce user ownership in tag operations.
- Enhanced API routes to include user authentication and ownership checks for tag retrieval and management.
- Modified seeding script to assign tags to the first user found in the database.
- Updated various components and services to ensure user-specific tag handling throughout the application.

prisma/schema.prisma

@@ -24,6 +24,7 @@ model User {
   notes           Note[]
   dailyCheckboxes DailyCheckbox[]
   tasks           Task[]           @relation("TaskOwner")
+  tags            Tag[]            @relation("TagOwner")
 
   @@map("users")
 }
@@ -63,13 +64,16 @@ model Task {
 
 model Tag {
   id           String    @id @default(cuid())
-  name         String    @unique
+  name         String
   color        String    @default("#6b7280")
   isPinned     Boolean   @default(false)
+  ownerId      String    // Chaque tag appartient à un utilisateur
+  owner        User      @relation("TagOwner", fields: [ownerId], references: [id], onDelete: Cascade)
   taskTags     TaskTag[]
   primaryTasks Task[]    @relation("PrimaryTag")
   noteTags     NoteTag[]
 
+  @@unique([name, ownerId]) // Un nom de tag unique par utilisateur
   @@map("tags")
 }