Issue W1-B3-02 — Progress and Performance API Foundation

[Abdully-dev]

📋 Overview
Prepare the service boundaries for future student analysis.
This issue does not implement BKT yet. It establishes where progress and performance logic will live.
🎯 Objectives
• Create progress schemas.
• Create progress service skeleton.
• Create performance analyzer skeleton.
• Define progress response format.
• Define topic performance response format.
🎯 Scope
API and service contracts only.
🔗 Call Chain
Attempts
↓
Performance Analyzer
↓
Progress Service
↓
Progress API
⚙️ Technical Notes
Do not hardcode frontend-specific calculations inside routes.
Routes call services.
Services call analysis logic.
🚫 Out of Scope
• BKT formulas
• Recommendations
• AI teaching
🔗 Dependencies
• W1-B3-01 Attempt Architecture
✅ Acceptance Criteria
• Progress schema exists.
• Service boundary is defined.
• API endpoint returns valid placeholder/test data.
• No business logic exists directly inside routes.
🌿 Branch
progress-performance-foundation
🚨 Files Concerned
backend/app/
├── schemas/
│ └── progress.py
├── api/routes/
│ └── progress.py
├── services/
│ └── progress_service.py
└── adaptive/
└── performance_analyzer.py