feat: add AI Developer Reputation Engine dashboard

[saidai-bhuvanesh]

🚀 [Feature] AI Developer Reputation Engine Dashboard

🎯 Objective

This PR introduces an enterprise-grade AI Developer Reputation Engine designed to provide advanced contributor intelligence, OSS impact visualization, reputation scoring, and realtime developer analytics inside the DevCard ecosystem.

The implementation expands the analytics infrastructure with highly interactive visualization systems powered entirely by lightweight native Svelte 5 rendering and custom SVG-based analytics components.

---

✨ Features

• AI-powered developer reputation scoring
• Contributor tier ranking system (Diamond / Gold / Silver)
• OSS impact timeline visualization
• Interactive contribution radar analytics
• Zero-dependency SVG radar chart rendering
• Responsive analytics dashboard system
• Enterprise glassmorphism-inspired UI
• Accessible visualization infrastructure
• Native Svelte 5 reactive rendering system

---

🏗️ Technical Implementation

Added Components

• ReputationScoreCard.svelte
• OSSImpactGraph.svelte
• ContributionRadar.svelte

Architecture Enhancements

• Implemented custom SVG circular progress visualization
• Built lightweight radar chart system without external chart libraries
• Used Svelte 5 $props, $state, and $derived APIs
• Preserved isolated modular component architecture
• Maintained frontend-only implementation safety

---

🛡️ Architecture Safety

• Frontend-only implementation
• Zero backend schema modifications
• No API contract changes
• No routing rewrites introduced
• Reusable visualization component system
• Minimal merge conflict probability

---

⚡ Performance Optimizations

• Zero heavy chart library dependencies
• Lightweight native SVG rendering
• Optimized reactive rendering flows
• Reduced unnecessary rerenders
• Efficient dynamic visualization calculations

---

♿ Accessibility Improvements

• Accessible interactive graph elements
• Semantic visualization rendering
• Improved screen-reader compatibility
• WCAG-friendly interaction patterns
• Responsive analytics layouts

---

🧪 Validation

✔ pnpm check passed successfully
✔ pnpm build passed successfully
✔ Svelte 5 compatibility verified
✔ Responsive rendering validated
✔ SVG visualization rendering validated locally
✔ Zero TypeScript compilation issues

---

📸 Demo

(Attach screenshots/GIF previews of the AI Reputation Engine dashboard here.)

---

✅ Checklist

• Code follows repository guidelines
• Self-review completed
• Build verification completed
• Frontend-only architecture preserved
• No unrelated modifications included
• Accessibility-safe rendering verified
• Svelte 5 APIs used correctly
• Zero-dependency visualization infrastructure maintained

[saidai-bhuvanesh]

The AI Developer Reputation Engine has been fully validated locally using `pnpm check` and `pnpm build`.

This implementation uses lightweight native SVG rendering and modern Svelte 5 APIs to avoid heavy visualization dependencies while preserving responsive and accessible analytics rendering.

Screenshots/GIF previews will also be attached shortly for easier maintainer review.

[saidai-bhuvanesh]

Applied a complete frontend architecture hardening pass including reusable visualization extraction, accessibility improvements, security-safe rendering updates, performance optimizations, duplicate rendering cleanup, and reusable analytics infrastructure stabilization.