feat: Ultrabeam over USB, Paper QSL from the awards grid, per-role schemas

Ultrabeam on a serial port never worked, and three faults were stacked so
each hid the next:

  - Stop() did not wait for the poll loop, so a stopped client kept the COM
    port. Every later client then failed with "Serial port busy" — the
    program holding it being OpsLog itself.
  - startUltrabeam tore the old client down CONCURRENTLY with starting the
    new one, and "Test connection" built a second client on a port already
    ours. Harmless over TCP, fatal on a port with one owner.
  - A silent serial port returns (0, nil) and bufio retries that a hundred
    times: a 4 s timeout became ~7 minutes of a frozen poll loop logging
    nothing.

The controller then answered at once. Confirmed on hardware: the USB cable
presents TWO COM ports, only the second reaches the controller, and only at
19200 baud — so the speed is pinned in code (an FTDI cable opens at any
speed, and a wrong one is indistinguishable from a dead controller) and the
port field says which one to pick. The first exchange after each connect is
hex-dumped, which separates silence from a wrong baud from a misread frame.

Databases now carry only the tables their role needs. Every target used to
get the whole migration set, so a shared MySQL logbook grew settings and
station_profiles tables nothing ever wrote to — an operator inspecting the
server could not tell which copy was authoritative. Statements are filtered
by role, unknown tables are kept in both (fail-safe), and existing databases
are cleaned once, dropping only EMPTY tables. Settings → Database gains a
Compact button, since SQLite frees pages inside the file and never shrinks it.

Also:
  - Awards: the callsigns behind a cell open the QSL Manager on Paper QSL,
    searched, ready for the card dates.
  - The record button no longer goes missing after an update: whether manual
    recording is possible is a per-profile question that was asked once, at
    startup, before the profile was known.
  - Alert rules and filter presets confirm that they were saved.
  - Spot clicks on the radio panadapter carry the POTA park into F3.
  - The build gate is re-checked wherever the active callsign can change; it
    ran at startup alone, and a fresh install has no callsign then.

gate_coverage_test.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"os"
+	"strings"
+	"testing"
+)
+
+// The build gate is only as good as the moments it runs at.
+//
+// It used to run at startup alone, on the profile active then — and a fresh
+// install has NO callsign at that point. The operator typed theirs afterwards,
+// so a denied call ran for the whole session and reached the telemetry, which
+// reads the very same field. Every place that can make a denied callsign the
+// ACTIVE one has to re-ask.
+func TestCallGateRunsWhereverTheActiveCallsignChanges(t *testing.T) {
+	src, err := os.ReadFile("app.go")
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, fn := range []string{
+		"func (a *App) startup(ctx context.Context) {",                 // launch
+		"func (a *App) SaveStationSettings(s StationSettings) error {", // the call is entered here
+		"func (a *App) SaveProfile(p profile.Profile) (profile.Profile, error) {",
+		"func (a *App) ActivateProfile(id int64) error {",
+	} {
+		body := funcBody(t, string(src), fn)
+		if !strings.Contains(body, "enforceCallGate(") {
+			t.Errorf("%s can change the active callsign but never re-checks the gate", fn)
+		}
+	}
+}
+
+// The hashes are the whole mechanism: a truncated or re-cased entry silently
+// matches nothing, and nothing in the running program would ever say so.
+func TestDeniedCallHashesAreWellFormed(t *testing.T) {
+	if len(deniedCallHashes) == 0 {
+		t.Fatal("the deny list is empty — the gate has stopped gating")
+	}
+	for h := range deniedCallHashes {
+		if len(h) != 64 {
+			t.Errorf("hash %q is %d chars, want 64", h, len(h))
+		}
+		if h != strings.ToLower(h) {
+			t.Errorf("hash %q is not lower-case, so it can never match", h)
+		}
+	}
+}
+
+// A slashed call must reduce to the real one, or /P is a way round the gate.
+func TestDenyBaseCall(t *testing.T) {
+	for in, want := range map[string]string{
+		"f4xyz":    "F4XYZ",
+		" F4XYZ ":  "F4XYZ",
+		"F4XYZ/P":  "F4XYZ",
+		"TM/F4XYZ": "F4XYZ",
+		"F4XYZ/MM": "F4XYZ",
+		"":         "",
+	} {
+		if got := denyBaseCall(in); got != want {
+			t.Errorf("denyBaseCall(%q) = %q, want %q", in, got, want)
+		}
+	}
+}