v1.0.0 — first release

Bump VERSION to 1.0.0 and cut the first tagged release of vpp-maglev.

Also in this commit:

- maglevc: MAGLEV_SERVER env var as an alternative to the --server
  flag, matching the MAGLEV_CONFIG / MAGLEV_GRPC_ADDR convention on
  the other binaries. The flag takes precedence when both are set.
- Rename cmd/maglevd -> cmd/server and cmd/maglevc -> cmd/client so
  the source directory names are decoupled from binary names (the
  frontend and tester commands already followed this convention).
  Build outputs and the Debian packages are unchanged.

cmd/client/color.go

@@ -0,0 +1,52 @@
+// Copyright (c) 2026, Pim van Pelt <pim@ipng.ch>
+
+package main
+
+import "strings"
+
+const (
+	ansiBlue  = "\x1b[34m"
+	ansiRed   = "\x1b[31m"
+	ansiReset = "\x1b[0m"
+)
+
+// colorEnabled is set by the -color flag in main.
+var colorEnabled bool
+
+// label wraps s in dark-blue ANSI when color output is enabled.
+//
+// Tabwriter caveat: tabwriter.Writer counts *bytes* per cell, not
+// rendered columns. ANSI escape codes (`\x1b[34m…\x1b[0m`, 11 bytes)
+// inflate a cell's apparent width without affecting what the terminal
+// draws. Two things follow:
+//
+//  1. Key-value layouts where column 1 is *always* labelled and
+//     column 2 is *always* plain (e.g. `show vpp info`) stay aligned,
+//     because every row adds the same 11 bytes to column 1.
+//  2. Multi-column tables where only the *header* row is labelled
+//     drift: the header cells each carry 11 extra bytes that the data
+//     rows don't, so data cells get over-padded. In those tables,
+//     leave the header plain (see runShowVPPLBCounters) and only use
+//     label() for labels that appear uniformly column-wise.
+func label(s string) string {
+	if !colorEnabled {
+		return s
+	}
+	return ansiBlue + s + ansiReset
+}
+
+// formatError returns a user-friendly error string. gRPC status errors are
+// unwrapped to show only the server's message (no "rpc error: code = ..."
+// boilerplate). The result is wrapped in red ANSI when color is enabled.
+func formatError(err error) string {
+	msg := err.Error()
+	// google.golang.org/grpc/status errors format as:
+	//   rpc error: code = <Code> desc = <message>
+	if i := strings.Index(msg, " desc = "); i >= 0 {
+		msg = msg[i+len(" desc = "):]
+	}
+	if colorEnabled {
+		return ansiRed + msg + ansiReset
+	}
+	return msg
+}