feat: add 50 backend interview questions and answers

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Generated comprehensive interview preparation materials covering:
- Distributed systems (transactions, locks, ID generation, consistency)
- Database (indexing, sharding, replication, transactions)
- Caching (Redis, cache problems, distributed lock)
- Message queues (RocketMQ, Kafka)
- Concurrency (ThreadLocal, ConcurrentHashMap, thread pools)
- JVM (GC, memory, tuning)
- System design (seckill, short URL, IM, feed, LBS)
- Algorithms (B+ tree, LRU, Red-Black tree, Skip list, Timing wheel)
- Network (TCP/IP, HTTP/HTTPS)
- Security (encryption, SQL injection, XSS)
- Performance tuning
- Design patterns
- Microservices (Spring Boot, Gateway, Service Mesh)
- Container orchestration (Kubernetes, Docker)
- CI/CD, observability

Each file includes:
- Detailed questions
- Comprehensive answers
- Code examples
- Real project experience
- Alibaba P7 level requirements

Generated with [Claude Code](https://claude.com/claude-code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

...

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yasinshaw

2026-03-01 00:09:50 +08:00

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