feat(security): deprecate weak hash algorithms and enforce strong sec…

[Praying]

…rets

• Mark SHA-1 and MD5 as deprecated in HashAlgorithm enum with security warnings
• Add minimum 32-character requirement for JWT secret keys to prevent brute-force attacks
• Implement secret length validation in jwt_sign function with detailed error messages
• Update JWT examples to use strong secrets with at least 32 characters
• Add comprehensive tests for weak secret rejection and minimum valid secret acceptance
• Remove deprecated test binary configuration and source file
• Add request body size validation in HTTP client to prevent DoS attacks
• Introduce max_request_size configuration with 10MB default and 100MB maximum
• Add validation for request size limits in HTTP configuration
• Reduce WebSocket pong timeout from 90 seconds to 30 seconds for faster zombie detection
• Improve circuit breaker failure recording with atomic state transitions
• Enhance rate limiter calculations using u128 to prevent overflow for long uptimes
• Update documentation comments and test descriptions with security considerations