Tie points to locator serial numbers and store receiver telemetry

Field setups often relay through a phone/gateway that owns the MQTT
connection, so the publishing credential and the instrument are now
separate concepts:

- Points messages carry a "serial" identifying the locator receiver;
  unknown serials are auto-registered as devices in the publisher's
  org (name "Locator <serial>"). Device.mqttUsername is now optional
  and serialNumber is unique per org.
- LocatePoint gains standard receiver telemetry: frequencyHz,
  currentMa, signalDb, gainDb, locateMode (PEAK/NULL/BROAD_PEAK/SONDE),
  phaseDeg, compassDeg, distortionPct, plus GPS quality columns
  vAccuracy, satellites, hdop. All optional; raw payload still kept.
- Migration hand-edited to preserve the generated geom column and its
  GIST index (Prisma diff wanted to drop both).
- REST create/point DTOs, map tooltips, job-detail latest-point
  readout, devices settings form, seed, and the sample publisher all
  carry the new fields.
- Added .dockerignore for backend/web: COPY . . was clobbering the
  image's freshly generated Prisma client with the host's stale
  node_modules, breaking image builds after schema changes.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/components/map/google/GoogleJobMap.tsx

@@ -1,7 +1,7 @@
 /// <reference types="google.maps" />
 import { APIProvider, Map as GoogleMap, useMap } from '@vis.gl/react-google-maps';
 import { useEffect, useRef } from 'react';
-import { JobMapProps, MapPoint, UTILITY_COLORS } from '../types';
+import { JobMapProps, MapPoint, pointSummary, UTILITY_COLORS } from '../types';
 
 const API_KEY = process.env.NEXT_PUBLIC_GOOGLE_MAPS_API_KEY || '';
 
@@ -67,7 +67,7 @@ function PointsLayer({ points, fitBounds }: { points: MapPoint[]; fitBounds: boo
             strokeColor: '#ffffff',
             strokeWeight: 1.5,
           },
-          title: `${p.utilityType} · ${p.fixType}${p.depth != null ? ` · depth ${p.depth}m` : ''}\n${new Date(p.recordedAt).toLocaleString()}`,
+          title: `${pointSummary(p)}\n${new Date(p.recordedAt).toLocaleString()}`,
         });
         overlaysRef.current.push(marker);
       }