[Feature Request] Debate Analytics Dashboard

## 📌 Description

Add a Debate Analytics Dashboard that provides users with detailed insights into their debate performance after each debate and over time.

This dashboard would help users improve debating skills, track progress, and increase long-term engagement with the platform.

## 🎯 Motivation / Problem Statement

Currently, once a debate ends, users receive limited feedback. There is no way to:

- Analyze debate performance
- Track improvement across debates
- Compare strengths and weaknesses
- A Debate Analytics Dashboard would transform DebateAI from just a debate platform into a learning and performance-tracking tool.

### ✨ Proposed Features
🧾 Post-Debate Analytics

After each debate, show:

- Total arguments made per participant
- Average response time
- Rebuttal count
- Argument length distribution
- Debate duration

## 🧠 AI-Assisted Insights (Optional / Phase 2)
-
- Argument strength score (AI-generated)
- Logical consistency score
- Highlight strongest arguments
- Identify weak or repetitive points

## 📊 User Performance Dashboard

A new dashboard page showing:

- Debate history
- Win/Loss ratio
- Average scores over time
- Topic-wise performance
- Improvement trends (charts)

## 🏗️ Suggested Implementation (High-Level)
### Backend

- Store debate metadata and timestamps
- Add analytics computation after debate ends
- Optional: AI-generated summaries and scores

New API endpoints:

- GET /debates/{id}/analytics
- GET /users/{id}/analytics

### Frontend

- New Analytics Dashboard page
- Post-debate modal with stats
- Charts (bar/line/radar) for performance tracking

## ✅ Benefits

- Improves learning value of debates
- Encourages repeat usage
- Adds competitive and self-improvement elements
- Strong foundation for future ranking/leaderboard features

I am willing to submit a PR.

🔖 Labels

enhancement feature-request analytics frontend backend