feat: Implement project setup and core infrastructure with template system

[CodeGuideDev]

Summary

This PR implements the foundational architecture for the outline generation application, completing the first two high-priority tasks:

Task 1: Project Setup and Core Infrastructure ✅

• Next.js 15 with TypeScript and Tailwind CSS
• Clerk authentication with secure middleware and route protection
• Supabase PostgreSQL database with comprehensive RLS policies
• Redis integration for session caching and rate limiting
• Docker containerization with development and production configurations
• Enhanced security with AES-256 encryption and security headers
• Environment validation and comprehensive configuration management

Task 2: Template System and Outline Generation Engine ✅

• JSON-based template framework with customizable sections and validation
• OpenAI GPT-4 API integration for AI-powered outline generation
• Anthropic Claude support as alternative AI provider with fallback mechanisms
• Rate limiting and queue system for API request management
• Template storage system with public/private templates and categories
• Project outline management with real-time updates
• Version control system with complete history tracking

Database Schema

Comprehensive database design with:

• Projects table with owner/collaborator support
• Templates table with 5 predefined templates (Basic, Technical, Marketing, Business, Academic)
• Project versions for complete version history
• Comments system for collaboration features
• Export history tracking
• AI generation logs for analytics and debugging

API Endpoints

Complete REST API with rate limiting:

• Projects CRUD operations
• Template management
• AI outline generation
• Outline management
• Version control

Security & Performance

Enterprise-grade security implementation:

• AES-256 data encryption at rest
• JWT token management with Clerk
• Row-level security (RLS) policies on all tables
• Rate limiting on all API endpoints
• Redis caching for improved performance
• Input validation and XSS protection
• Security headers (CSP, HSTS, X-Frame-Options, etc.)

Infrastructure

Production-ready deployment setup:

• Docker multi-stage builds with security optimization
• Docker Compose for local development with PostgreSQL and Redis
• Environment configuration with comprehensive validation

Metrics

• 26 files changed with 3,569 insertions
• 2 major tasks completed (40% of project scope)
• 10+ API endpoints implemented
• 5 predefined templates with extensible system
• Enterprise security standards implemented

🤖 Generated with Claude Code