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>

test/publish_sample.py

@@ -3,11 +3,16 @@
 The backend subscribes to devices/# and expects points at
 devices/{mqttUsername}/points with a JSON body:
 
-    {"ticket": "TKT-...", "points": [{"lat": .., "lng": .., "ts": "ISO8601", ...}]}
+    {"serial": "...", "ticket": "TKT-...",
+     "points": [{"lat": .., "lng": .., "ts": "ISO8601", ...}]}
 
-Points for an unknown ticket auto-create a stub job (source=DEVICE).
+The MQTT username identifies the publisher (app/gateway) and its org; "serial"
+names the locator receiver the readings came from (auto-registered on first
+sight). Points for an unknown ticket auto-create a stub job (source=DEVICE).
 """
 
+import random
+
 import json
 import os
 import time
@@ -19,6 +24,7 @@ BROKER_HOST = os.getenv("MQTT_HOST", "127.0.0.1")
 BROKER_PORT = int(os.getenv("MQTT_PORT", "1883"))
 USERNAME = os.getenv("MQTT_USERNAME", "testuser")
 PASSWORD = os.getenv("MQTT_PASSWORD", "testpass")
+SERIAL = os.getenv("SERIAL", "DEMO-0001")
 TICKET = os.getenv("TICKET", "TKT-2026-0001")
 INTERVAL = float(os.getenv("MQTT_INTERVAL", "2"))
 
@@ -37,6 +43,7 @@ try:
     seq = 0
     while True:
         payload = {
+            "serial": SERIAL,
             "ticket": TICKET,
             "points": [
                 {
@@ -45,7 +52,17 @@ try:
                     "alt": 187.4 + seq * 0.02,
                     "fix": "FIXED_RTK",
                     "hAcc": 0.014,
-                    "depth": 1.2,
+                    "vAcc": 0.021,
+                    "sats": random.randint(18, 26),
+                    "hdop": 0.7,
+                    "depth": round(1.1 + random.uniform(0, 0.3), 2),
+                    "freqHz": 33000,
+                    "currentMa": round(50 - seq * 0.4 + random.uniform(-1, 1), 1),
+                    "signalDb": round(62 - seq * 0.2 + random.uniform(-0.5, 0.5), 1),
+                    "gainDb": 40,
+                    "mode": "PEAK",
+                    "compassDeg": round(17.5 + random.uniform(-3, 3), 1),
+                    "distortionPct": round(random.uniform(2, 8), 1),
                     "utility": "GAS",
                     "seq": seq + 1,
                     "ts": datetime.now(timezone.utc).isoformat(),