diff --git a/.cursor/rules/business-logic-separation.mdc b/.cursor/rules/business-logic-separation.mdc
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+---
+alwaysApply: true
+description: Enforce business logic separation between frontend and backend
+---
+
+# Business Logic Separation Rules
+
+## Core Principle: NO Business Logic in Frontend
+
+All business logic, data processing, and domain rules MUST be implemented in the backend services layer. The frontend is purely for presentation and user interaction.
+
+## ✅ ALLOWED in Frontend ([components/](mdc:components/), [hooks/](mdc:hooks/), [clients/](mdc:clients/))
+
+### Components
+- UI rendering and presentation logic
+- Form validation (UI-level only, not business rules)
+- User interaction handling (clicks, inputs, navigation)
+- Visual state management (loading, errors, UI states)
+- Data formatting for display purposes only
+
+### Hooks
+- React state management
+- API call orchestration (using clients)
+- UI-specific logic (modals, forms, animations)
+- Data fetching and caching coordination
+
+### Clients
+- HTTP requests to API routes
+- Request/response transformation (serialization only)
+- Error handling and retry logic
+- Authentication token management
+
+## ❌ FORBIDDEN in Frontend
+
+### Business Rules
+```typescript
+// ❌ BAD: Business logic in component
+const TaskCard = ({ task }) => {
+  const canEdit = task.status === 'open' && task.assignee === currentUser.id;
+  const priority = task.dueDate < new Date() ? 'high' : 'normal';
+  // This is business logic!
+}
+
+// ✅ GOOD: Get computed values from backend
+const TaskCard = ({ task }) => {
+  const { canEdit, priority } = task; // Computed by backend service
+}
+```
+
+### Data Processing
+```typescript
+// ❌ BAD: Data transformation in frontend
+const processJiraTasks = (tasks) => {
+  return tasks.map(task => ({
+    ...task,
+    normalizedStatus: mapJiraStatus(task.status),
+    estimatedHours: calculateEstimate(task.storyPoints)
+  }));
+}
+
+// ✅ GOOD: Data already processed by backend service
+const { processedTasks } = await tasksClient.getTasks();
+```
+
+### Domain Logic
+```typescript
+// ❌ BAD: Domain calculations in frontend
+const calculateTeamVelocity = (sprints) => {
+  // Complex business calculation
+}
+
+// ✅ GOOD: Domain logic in service
+// This belongs in services/team-analytics.ts
+```
+
+## ✅ REQUIRED in Backend ([services/](mdc:services/), [app/api/](mdc:app/api/))
+
+### Services Layer
+- All business rules and domain logic
+- Data validation and processing
+- Integration with external APIs (Jira, macOS Reminders)
+- Complex calculations and algorithms
+- Data aggregation and analytics
+- Permission and authorization logic
+
+### API Routes
+- Input validation and sanitization
+- Service orchestration
+- Response formatting
+- Error handling and logging
+- Authentication and authorization
+
+## Implementation Pattern
+
+### ✅ Correct Flow
+```
+User Action → Component → Client → API Route → Service → Database
+                ↑                                ↓
+            Pure UI Logic              Business Logic
+```
+
+### ❌ Incorrect Flow
+```
+User Action → Component with Business Logic → Database
+```
+
+## Examples
+
+### Task Status Management
+```typescript
+// ❌ BAD: In component
+const updateTaskStatus = (taskId, newStatus) => {
+  if (newStatus === 'done' && !task.hasAllSubtasks) {
+    throw new Error('Cannot complete task with pending subtasks');
+  }
+  // Business rule in frontend!
+}
+
+// ✅ GOOD: In services/task-processor.ts
+export const updateTaskStatus = async (taskId: string, newStatus: TaskStatus) => {
+  const task = await getTask(taskId);
+  
+  // Business rules in service
+  if (newStatus === 'done' && !await hasAllSubtasksCompleted(taskId)) {
+    throw new BusinessError('Cannot complete task with pending subtasks');
+  }
+  
+  return await updateTask(taskId, { status: newStatus });
+}
+```
+
+### Team Analytics
+```typescript
+// ❌ BAD: In component
+const TeamDashboard = () => {
+  const calculateBurndown = (tasks) => {
+    // Complex business calculation in component
+  }
+}
+
+// ✅ GOOD: In services/team-analytics.ts
+export const getTeamBurndown = async (teamId: string, sprintId: string) => {
+  // All calculation logic in service
+  const tasks = await getSprintTasks(sprintId);
+  return calculateBurndownMetrics(tasks);
+}
+```
+
+## Enforcement
+
+When reviewing code:
+1. **Components**: Should only contain JSX, event handlers, and UI state
+2. **Hooks**: Should only orchestrate API calls and manage React state  
+3. **Clients**: Should only make HTTP requests and handle responses
+4. **Services**: Should contain ALL business logic and data processing
+5. **API Routes**: Should validate input and call appropriate services
+
+## Red Flags
+
+Watch for these patterns that indicate business logic in frontend:
+- Complex calculations in components/hooks
+- Business rule validation in forms
+- Data transformation beyond display formatting
+- Domain-specific constants and rules
+- Integration logic with external systems
+
+Remember: **The frontend is a thin presentation layer. All intelligence lives in the backend.**
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diff --git a/.cursor/rules/todo-tracking.mdc b/.cursor/rules/todo-tracking.mdc
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+---
+alwaysApply: true
+description: Automatic TODO tracking and task completion management
+---
+
+# TODO Task Tracking Rules
+
+## Automatic Task Completion
+
+Whenever you complete a task or implement a feature mentioned in [TODO.md](mdc:TODO.md), you MUST:
+
+1. **Immediately update the TODO.md** by changing `- [ ]` to `- [x]` for the completed task
+2. **Use the exact task description** from the TODO - don't modify the text
+3. **Update related sub-tasks** if completing a parent task affects them
+4. **Add completion timestamp** in a comment if the task was significant
+
+## Task Completion Examples
+
+### ✅ Correct completion marking:
+```markdown
+- [x] Initialiser Next.js avec TypeScript
+- [x] Configurer ESLint, Prettier  
+- [x] Setup structure de dossiers selon les règles du workspace
+```
+
+### ✅ With timestamp for major milestones:
+```markdown
+- [x] Créer `services/database.ts` - Pool de connexion DB <!-- Completed 2025-01-15 -->
+```
+
+## When to Update TODO.md
+
+Update the TODO immediately after:
+- Creating/modifying files mentioned in tasks
+- Implementing features described in tasks  
+- Completing configuration steps
+- Finishing any work item listed in the TODO
+
+## Task Dependencies
+
+When completing tasks, consider:
+- **Parent tasks**: Mark parent complete only when ALL sub-tasks are done
+- **Blocking tasks**: Some tasks may unblock others - mention this in updates
+- **Phase completion**: Note when entire phases are completed
+
+## Progress Tracking
+
+Always maintain visibility of:
+- Current phase progress
+- Next logical task to tackle
+- Any blockers or issues encountered
+- Completed vs remaining work ratio
+
+This ensures the TODO.md remains an accurate reflection of project progress and helps maintain momentum.
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