App 2.3.0: Server tab, live telemetry to the car server

- New Server tab: server URL, ingest token and installation id, with
  Save, Test connection (health, then a read-only token check) and the
  config-file import that upstream removed (app folder / USB stick first,
  document picker as fallback). Settings are kept encrypted and read on
  every use, so the service picks up a change without a restart. Each
  installation generates its own id; the inherited upstream UUID and
  the baked-in CONSUMPTION_API_* build fields are gone.
- Live telemetry restored from before ea8032a (TelemetryPayload,
  UploadCadence, UploadSettings, GPS) and sent in batches to
  POST /v1/telemetry instead of ABRP; the server forwards to ABRP. Adds
  ext_temp, voltage and current. Unsent samples queue in memory (about
  8 h) while offline.
- Upload tab: the live-telemetry switch and cadence controls work again;
  the dead service and autostart switches are removed.
- Manifest: location permissions and foreground service types.
- Unit tests compile again: 114 (stable) / 136 (unstable) pass. Tests
  for the deleted AbrpApi and HeadUnitWeather removed; new tests for
  ServerConfig and TelemetryQueue. Lint passes.

Not yet tried on the car.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/build.gradle

@@ -34,17 +34,11 @@ android {
         applicationId "com.stinnesbeck.nilsmg4"
         minSdk 27
         targetSdk 36
-        versionCode 56
-        versionName "2.2.39"
+        versionCode 57
+        versionName "2.3.0"
 
-        // MongoDB credentials never ship in the APK. The app only talks to the small
-        // authenticated API in server/, which owns the database connection.
-        buildConfigField "String", "CONSUMPTION_API_URL", "\"${System.getenv('CONSUMPTION_API_URL') ?: ''}\""
-        buildConfigField "String", "CONSUMPTION_API_TOKEN", "\"${System.getenv('CONSUMPTION_API_TOKEN') ?: ''}\""
-        // Fixed installation identity: baked into every build so an APK wipe cannot orphan
-        // the cloud history under a new random UUID. The car's own consumption history lives
-        // under this id in the daily_consumption collection.
-        buildConfigField "String", "CONSUMPTION_INSTALLATION_ID", "\"226b1614-4d18-48f0-8938-3609cfa3db93\""
+        // Nothing about the server ships in the APK: its URL and ingest token are entered in
+        // the app's Server tab (ServerConfig), and the database is only reachable by the server.
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }