Phase 6: schedules, blocklists, allowlists (editors + effective state)

- Weekly schedule editor per device: a Monday-Sunday grid of blocking
  windows, including windows that cross midnight.
- Blocklist/allowlist editor per device: app (Android package / Windows
  process) and site (hostname) entries, tagged by the device platform.
- Effective desired state: a manual lock, an active schedule window, or
  neither. While blocked the allowlist is honoured (Spotify stays while
  other apps are blocked). Published retained with reason schedule/manual.
- Boundary-aware republish loop so a window turns on and off on time,
  and manual lock expiry is cleared promptly.
- CONTROL_TIMEZONE (default Australia/Sydney) with embedded tzdata, so
  wall-clock windows are evaluated in the family zone, not the container.
- Every change is written to the append-only audit log (FR-15).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

internal/config/config_test.go

@@ -37,6 +37,29 @@ func TestLoadDefaultsAndValidation(t *testing.T) {
 	if !cfg.CookieSecure {
 		t.Error("CookieSecure = false, want true by default")
 	}
+	if cfg.ScheduleLocation == nil || cfg.ScheduleLocation.String() != DefaultTimezone {
+		t.Errorf("ScheduleLocation = %v, want %s", cfg.ScheduleLocation, DefaultTimezone)
+	}
+}
+
+func TestScheduleTimezone(t *testing.T) {
+	t.Setenv("CONTROL_SESSION_SECRET", "0123456789abcdef")
+	t.Setenv("CONTROL_ADMIN_PASSWORD", "hunter2")
+	t.Setenv("CONTROL_MQTT_INSECURE", "true")
+
+	t.Setenv("CONTROL_TIMEZONE", "UTC")
+	cfg, err := Load()
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if cfg.ScheduleLocation == nil || cfg.ScheduleLocation.String() != "UTC" {
+		t.Errorf("ScheduleLocation = %v, want UTC", cfg.ScheduleLocation)
+	}
+
+	t.Setenv("CONTROL_TIMEZONE", "Not/AZone")
+	if _, err := Load(); err == nil {
+		t.Error("expected an error for an unknown CONTROL_TIMEZONE")
+	}
 }
 
 func TestLoadRequiresSecretAndPassword(t *testing.T) {