G1000: manual-accurate radios, baro units, declutter, minimums, OBS, audio panel

Aligned to the official X-Plane 1000 manual:
- NAV radio: active RIGHT / standby LEFT (boxed) per S.12 (COM already correct)
- ALT UNIT softkey (IN / HPA) in the PFD submenu, baro readout converts (S.20)
- DCLTR cycles 3 levels (land / +NDB / flight-plan only) with DCLTR-n label (S.56)
- TOPO and TERRAIN are now independent toggles (relief vs awareness overlay) (S.57)
- Barometric MINIMUMS: BARO MIN bug + readout on the altimeter, amber "MINIMUMS"
  annunciation at/below the decision altitude; set via TMR/REF (lifted to App)
- OBS mode: HSI course follows the CRS knob (magenta "OBS"), sequencing suspended
- New Audio Panel tab (COM mic/receive, MKR/DME/ADF, intercom, Display Backup) (S.91)

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

server/navdata.js

@@ -46,10 +46,10 @@ const ilsApts = new Set();     // ICAOs that have an ILS/LOC approach (for NRST
 const awyCells = new Map();    // "ilat,ilon" (segment midpoint) -> [{ la1, lo1, la2, lo2, name }]
 const state = { root: null, loaded: false, count: 0, awy: 0 };
 
-function add(id, lat, lon, type) {
+function add(id, lat, lon, type, name) {
   if (!id || !isFinite(lat) || !isFinite(lon)) return;
   const key = id.toUpperCase();
-  if (!index.has(key)) index.set(key, { id: key, lat, lon, type });
+  if (!index.has(key)) index.set(key, { id: key, lat, lon, type, name: name || '' });
 }
 
 function pushFix(f) {
@@ -101,7 +101,7 @@ async function parseNav(file) {
     if (code !== 2 && code !== 3) continue; // 2 = NDB, 3 = VOR/DME
     const lat = parseFloat(p[1]), lon = parseFloat(p[2]), id = p[7];
     const type = code === 2 ? 'NDB' : 'VOR';
-    add(id, lat, lon, type);
+    add(id, lat, lon, type, p.slice(10).join(' '));
     if (id && isFinite(lat) && isFinite(lon)) {
       // p[4] = frequency (VOR in 10 kHz e.g. 11630 → 116.30; NDB in kHz);
       // name is everything after the airport/region columns.
@@ -118,7 +118,7 @@ async function parseAirports(file) {
   let icao = null, name = '', elev = 0, placed = false;
   const place = (lat, lon) => {
     if (!isFinite(lat) || !isFinite(lon)) return;
-    add(icao, lat, lon, 'APT');
+    add(icao, lat, lon, 'APT', name);
     airports.push({ id: icao.toUpperCase(), lat, lon, name, elev });
     placed = true;
   };