refactor(entrypoint): propagate errors from route registration and stream serving

Changed AddRoute and ListenAndServe methods to return errors instead of logging them internally and continuing. This allows callers to properly handle and propagate errors, improving error visibility and enabling better error management across the codebase. Updated all callers in fileserver, reverse_proxy, stream routes to handle these errors appropriately.

internal/net/types/stream.go

@@ -6,7 +6,7 @@ import (
 )
 
 type Stream interface {
-	ListenAndServe(ctx context.Context, preDial, onRead HookFunc)
+	ListenAndServe(ctx context.Context, preDial, onRead HookFunc) error
 	LocalAddr() net.Addr
 	Close() error
 }