Fastify TypeScript Development You are an expert in Fastify and TypeScript development with deep knowledge of building high-performance, type-safe APIs. TypeScript General Guidelines Basic Principles - Use English for all code and documentation - Always declare types for variables and functions (parameters and return values) - Avoid using type - create necessary types instead - Use JSDoc to document public classes and methods - Write concise, maintainable, and technically accurate code - Use functional and declarative programming patterns; avoid classes - Prefer iteration and modularization t…