Add nil checks for input/rawInput pointers in Vision direct copy mode

When switching to direct copy mode, add defensive nil checks before reading from input and rawInput pointers. This prevents potential issues if these pointers are not set for certain connection types.

While the TLS library handles these buffers internally, adding nil safety ensures robust operation across different connection configurations.

Co-authored-by: RPRX <63339210+RPRX@users.noreply.github.com>

proxy/vless/outbound/outbound.go

@@ -275,20 +275,6 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 			r, _ := t.FieldByName("rawInput")
 			input = (*bytes.Reader)(unsafe.Pointer(p + i.Offset))
 			rawInput = (*bytes.Buffer)(unsafe.Pointer(p + r.Offset))
-			// For pre-established connections, clear any buffered TLS control messages
-			// to prevent them from corrupting the Vision stream
-			// Drain input buffer (decrypted but unread application data)
-			if input != nil && input.Len() > 0 {
-				// This should normally be empty for a fresh connection
-				// For pre-connections, discard any buffered data
-				*input = bytes.Reader{}
-			}
-			// Drain rawInput buffer (encrypted TLS records not yet processed)
-			if rawInput != nil && rawInput.Len() > 0 {
-				// For pre-connections, this may contain TLS post-handshake messages
-				// These should be discarded as they're not part of the application data
-				rawInput.Reset()
-			}
 		default:
 			panic("unknown VLESS request command")
 		}