Add comprehensive interview guides for C++, Python, and Architecture domains

[Copilot]

This PR adds three specialized interview guides to help developers prepare for technical interviews across different domains:

📁 Files Added

/cpp/interview.md - C++ Interview Guide

Comprehensive coverage of modern C++ concepts including:

• Memory Management: RAII principles, smart pointers (unique_ptr, shared_ptr, weak_ptr), and memory optimization techniques
• STL Mastery: Container selection guide, algorithm usage, and performance considerations
• Modern C++ Features: C++11/14/17/20 features including move semantics, lambdas, structured bindings, concepts, and ranges
• Concurrency: Threading, atomic operations, lock-free programming, and async patterns
• Design Patterns: RAII-based patterns, PIMPL idiom, factory patterns, and C++-specific implementations

/python/interview.md - Python Interview Guide

In-depth Python concepts focusing on:

• GIL and Concurrency: Understanding the Global Interpreter Lock, threading vs multiprocessing, and async programming
• Advanced Features: Decorators, context managers, descriptors, and metaclasses with practical examples
• Async Programming: asyncio fundamentals, event loops, coroutines, and concurrent patterns
• Memory Management: Garbage collection, weak references, memory profiling, and optimization techniques
• Design Patterns: Pythonic implementations of classic patterns and Python-specific patterns

/architecture/interview.md - System Architecture Guide

Comprehensive system design coverage including:

• Design Principles: SOLID principles, CAP theorem, ACID vs BASE, and Domain-Driven Design
• Microservices: Service decomposition, communication patterns, data management, and observability
• Scalability: Horizontal scaling, caching strategies, load balancing, and auto-scaling
• Performance: Database optimization, application tuning, network optimization, and monitoring
• Security: Authentication/authorization, encryption, input validation, and API security

🎯 Key Features

Each guide includes:

• Practical Code Examples: Real-world implementations demonstrating concepts
• Interview Questions: Common technical interview questions with detailed answers
• Best Practices: Industry-standard approaches and anti-patterns to avoid
• Real-World Scenarios: Case studies from e-commerce, social media, and financial systems
• Performance Considerations: Optimization techniques and trade-off analysis

📊 Content Stats

• C++ Guide: 783 lines with comprehensive modern C++ coverage
• Python Guide: 1,654 lines with extensive async and concurrency examples
• Architecture Guide: 1,961 lines with real-world system design patterns

These guides serve as comprehensive reference materials for technical interview preparation, covering both theoretical concepts and practical implementation details that are commonly tested in senior developer and architect roles.

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