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/routes.d.ts

@@ -1,20 +0,0 @@
-type RouteDef = {
-	method: string;
-	accepts: string | null;
-	returns: string;
-	needsBody?: "multipart" | "json";
-};
-
-type Query = Record<string, string>;
-type Params = Record<string, string>;
-
-type RouteModule = {
-	handler: (
-		request: Request,
-		server: BunServer,
-		requestBody: unknown,
-		query: Query,
-		params: Params,
-	) => Promise<Response> | Response;
-	routeDef: RouteDef;
-};