Add comprehensive architectural analysis and SOLID principles improvement plan

[Copilot]

This PR provides a thorough architectural analysis of the JNetworking library and creates a detailed improvement plan to address SOLID principles violations and enhance code quality.

Analysis Summary

The current JNetworking architecture has several strengths but suffers from key architectural issues that impact maintainability, testability, and extensibility:

Critical Issues Identified

• Build failures due to missing FoundationNetworking imports for cross-platform compatibility
• Swift 6 compatibility warnings from generic parameter shadowing in JNWebClient
• SOLID principles violations throughout the codebase

Key SOLID Violations Found

Single Responsibility Principle (SRP)

• JNWebClient handles too many concerns: networking, parsing, error handling, and validation
• JNJSONResponseDecoder mixes JSON decoding with console logging

Open/Closed Principle (OCP)

• JNWebClient is a struct with private methods, making extension without modification difficult
• Response processing logic is hardcoded and not extensible

Dependency Inversion Principle (DIP)

• Hard dependency on URLSession.shared as default parameter
• JSONDecoder is hardcoded instead of being injectable

Documents Added

📋 IMPROVEMENT_CHECKLIST.md

A prioritized, actionable checklist organizing improvements into phases:

• Phase 1: Critical fixes (imports, Swift 6 compatibility)
• Phase 2: Core SOLID principle refactoring
• Phase 3: Modern Swift features (async/await)
• Phase 4: Enhanced developer experience

📖 ARCHITECTURAL_IMPROVEMENTS.md

Comprehensive 9,500+ word analysis covering:

• Detailed breakdown of each SOLID principle violation
• Specific impact assessment for each issue
• Complete architectural recommendations with code examples
• Migration strategy for backward compatibility

🛠️ IMPLEMENTATION_GUIDE.md

Practical before/after code examples showing:

• How to fix critical import issues
• Step-by-step refactoring for each SOLID principle
• Protocol-based design patterns to implement
• Modern Swift features integration (async/await, Sendable)

⚡ IMPROVEMENT_SUMMARY.md

Quick reference guide highlighting:

• Most critical issues requiring immediate attention
• Expected benefits of implementing improvements
• Clear migration path for existing users

Recommended Architecture

The analysis proposes transforming the current tightly-coupled design into a modular, protocol-based architecture:

// Current: One class doing everything
JNWebClient<T,E> { /* networking + parsing + errors */ }

// Proposed: Focused, composable components  
protocol NetworkClient { func execute(_:_:) }
protocol ResponseProcessor { func process(_:_:_:) }
protocol DataDecoder { func decode(_:from:) }

Expected Benefits

Implementing these improvements will provide:

• Better testability through dependency injection and focused responsibilities
• Improved maintainability via clear separation of concerns
• Enhanced flexibility using protocol-based design and strategy patterns
• Modern Swift support with async/await APIs
• Cross-platform compatibility with proper Foundation imports

Migration Strategy

The plan ensures zero breaking changes by:

• Keeping existing APIs functional with deprecation warnings
• Providing bridge adapters between old and new implementations
• Offering incremental adoption path for new features
• Including comprehensive migration documentation

This architectural foundation will transform JNetworking into a modern, well-designed networking framework that follows Swift best practices and SOLID principles while maintaining full backward compatibility.

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