feat: expand companion platform, device controls, and memoir workflows

Add customer and operator login, BLE provisioning, device fleet controls, call memory, memoir generation, and refreshed family and maintenance portals. Include API contracts, migrations, firmware sources, tests, assets, and deployment documentation.

internal/deviceconfig/name.go

@@ -0,0 +1,13 @@
+package deviceconfig
+
+import (
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+// Empty restores the default label. The byte limit fits the firmware NVS buffer.
+func ValidDisplayName(name string) bool {
+	return len(name) <= 96 && utf8.ValidString(name) && strings.TrimSpace(name) == name &&
+		strings.IndexFunc(name, unicode.IsControl) < 0
+}

internal/deviceconfig/name_test.go

@@ -0,0 +1,19 @@
+package deviceconfig
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestDisplayName(t *testing.T) {
+	for _, name := range []string{"", "客厅陪伴设备", strings.Repeat("名", 32), "卧室 · EchoEar"} {
+		if !ValidDisplayName(name) {
+			t.Fatalf("rejected %q", name)
+		}
+	}
+	for _, name := range []string{strings.Repeat("名", 33), " leading", "trailing ", "\u3000名称", "a\x00b", "a\nb", "a\u0085b", string([]byte{0xff})} {
+		if ValidDisplayName(name) {
+			t.Fatalf("accepted %q", name)
+		}
+	}
+}