refactor: improve code structure and add better logging

- Replace custom logger with @atums/echo library
- Restructure imports using # path aliases
- Add request performance tracking and better request logging
- Improve type definitions and error handling
- Add custom file serving capability
- Update biome configuration with stricter linting rules
- Add comprehensive API documentation (DOCS.md)

types/bun.ts

@@ -0,0 +1,10 @@
+type Query = Record<string, string>;
+type Params = Record<string, string>;
+
+interface ExtendedRequest extends Request {
+	startPerf: number;
+	query: Query;
+	params: Params;
+}
+
+export type { ExtendedRequest, Query, Params };