Manual audit fixes A/E/F: fuel totalizer, Victor/Jet airways, TIME TO BOD

A — Fuel totalizer (SYSTEM key, renamed from ENGINE): DEC/INC/RST FUEL had no
handler. Now adjust the fuel_totalizer_sum_kg dataref (±1 gal, RST→max fuel) and
the EIS shows the calculated remaining/used. cdiSrc-style writable + demo echo.

E — AIRWAYS: was a single on/off. earth_awy.dat field 8 (airway layer) is now
parsed (1=Victor/low, 2=Jet/high; name-prefix fallback), the bbox returns it, and
the AIRWAYS softkey cycles off→all→Victor→Jet with an AIRWY-LO/-HI label.

F — CURRENT VNV PROFILE now shows TIME TO BOD (bottom of descent) once past the
top of descent, instead of only TIME TO TOD.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/config.js

@@ -96,6 +96,8 @@ export const DATAREFS = {
   oilPress:    'sim/cockpit2/engine/indicators/oil_pressure_psi',
   egt:         'sim/cockpit2/engine/indicators/EGT_deg_C',
   fuelQty:     'sim/cockpit2/fuel/fuel_quantity',
+  fuelTot:     'sim/cockpit2/fuel/fuel_totalizer_sum_kg', // pilot-set fuel totalizer (remaining, kg)
+  fuelMax:     'sim/aircraft/weight/acf_m_fuel_tot',      // max fuel capacity (kg) — for RST FUEL
   volts:       'sim/cockpit2/electrical/bus_volts',     // array: [0]=main bus, [1]=essential
   amps:        'sim/cockpit2/electrical/battery_amps',  // battery (S) amps
   genAmps:     'sim/cockpit2/electrical/generator_amps', // alternator (M) amps
@@ -135,6 +137,7 @@ export const WRITABLE_DATAREFS = {
   xpdrMode: 'sim/cockpit2/radios/actuators/transponder_mode', // 0 off,1 stby,2 on,3 alt
   xpdrCode: 'sim/cockpit2/radios/actuators/transponder_code', // 4-digit squawk
   cdiSrc:   'sim/cockpit2/radios/actuators/HSI_source_select_pilot', // 0 NAV1 · 1 NAV2 · 2 GPS (CDI softkey cycles it)
+  fuelTot:  'sim/cockpit2/fuel/fuel_totalizer_sum_kg', // SYSTEM → DEC/INC/RST FUEL adjusts the totalizer
 };
 
 // Commands the frontend may TRIGGER (autopilot mode buttons etc.).