Initial project setup: HTTP to NNTP bridge with Leptos and GitHub Actions

[Copilot]

This PR implements the complete initial project setup for a HTTP to NNTP bridge server written in Rust using the Leptos web framework.

🚀 Features Implemented

Core Architecture

• Leptos Web Framework: Modern SSR-enabled web application with routing
• Axum HTTP Server: High-performance async web server with CORS support
• NNTP Client Integration: Foundation for newsgroup connectivity using the nntp crate
• Bridge Service: Modular architecture for HTTP ↔ NNTP protocol translation

Project Structure

src/
├── lib.rs          # Library entry point with module exports
├── main.rs         # HTTP server binary with Leptos integration
├── app.rs          # Frontend components (Home, Groups, Articles pages)
├── error.rs        # Centralized error handling with thiserror
├── nntp.rs         # NNTP client wrapper with async support
└── bridge.rs       # HTTP to NNTP bridge service

Development Experience

• GitHub Actions CI/CD: Automated testing, building, and security auditing
• Modern Tooling: Configured with proper Rust 2021 edition features
• Documentation: Comprehensive README with setup and usage instructions
• Responsive UI: SCSS-based styling with mobile-first design

Configuration Files

• Cargo.toml: Complete dependency setup for web and NNTP functionality
• Leptos.toml: Leptos-specific configuration for SSR and development
• .github/workflows/ci.yml: Full CI/CD pipeline with caching

🧪 Testing & Verification

The project successfully:

• ✅ Builds without warnings: cargo build
• ✅ Passes all tests: cargo test
• ✅ Runs development server: cargo run (http://127.0.0.1:3000)
• ✅ Validates with GitHub Actions workflow

🎯 Next Development Steps

The foundation is now ready for:

• Full NNTP protocol implementation
• Interactive newsgroup browsing UI
• Article viewing and posting functionality
• User authentication and session management
• Performance optimizations with caching

Fixes #1.

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