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.

motor_bandfreq_test.go

@@ -76,3 +76,30 @@ func TestMotorTuneKHzForBandFallsBack(t *testing.T) {
 		}
 	}
 }
+
+// The Ultrabeam's USB link answers on 19200 and on nothing else — confirmed on
+// hardware, where 9600 opened the port and returned not one byte. A speed with a
+// single right answer must not be storable as anything else, whatever an older
+// config or a hand-edited setting says.
+func TestNormMotorBaud(t *testing.T) {
+	for _, tc := range []struct {
+		typ, transport string
+		in, want       int
+	}{
+		{"ultrabeam", "serial", 9600, 19200},
+		{"ultrabeam", "serial", 0, 19200},
+		{"ultrabeam", "serial", 115200, 19200},
+		// Over TCP the speed is the adapter's business, not ours.
+		{"ultrabeam", "tcp", 9600, 9600},
+		// The SteppIR controller really does run at several speeds.
+		{"steppir", "serial", 4800, 4800},
+		{"steppir", "serial", 19200, 19200},
+		// Nonsense falls back rather than reaching the driver.
+		{"steppir", "serial", 0, 9600},
+		{"steppir", "serial", 999999, 9600},
+	} {
+		if got := normMotorBaud(tc.typ, tc.transport, tc.in); got != tc.want {
+			t.Errorf("normMotorBaud(%q, %q, %d) = %d, want %d", tc.typ, tc.transport, tc.in, got, tc.want)
+		}
+	}
+}