Server 2.4.0, app 2.11.1: ABRP forwarding removed from the server

The car sends live data to ABRP itself, and the car and the server go
over the same mobile connection: when the car cannot reach ABRP, it
cannot reach the server either, so the server's fallback bought
nothing. The forwarder, its ABRP_* settings and abrpSentUtc are gone;
the server only stores. The app stops sending abrpSentUtc (the server
ignores unknown fields, so 2.11.0 keeps working) and its texts no longer
promise a server fallback.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki

README.md

@@ -1,9 +1,9 @@
 # Nils' MG4
 
 An Android Automotive app for the **MG4 (SAIC eh32)** head unit, plus a small server: the car
-sends its telemetry to my own server at car.k8s.stinnesbeck.com, which stores it in InfluxDB 2,
-forwards live data to [A Better Route Planner](https://abetterrouteplanner.com) and feeds the
-Grafana dashboards.
+sends its telemetry to my own server at car.k8s.stinnesbeck.com, which stores it in InfluxDB 2
+for the Grafana dashboards, and its live data straight to
+[A Better Route Planner](https://abetterrouteplanner.com).
 
 No OBD dongle and no phone in the loop: the app runs on the head unit and reads the car's own
 APIs.
@@ -47,18 +47,16 @@ vehicle there, so every value shows as a dash).
 ## How it fits together
 
 ```
-car ──live telemetry───▶ car.k8s.stinnesbeck.com (Go) ──▶ ABRP (what the car did not send)
+car ──live telemetry───▶ car.k8s.stinnesbeck.com (Go)
  │  ──daily chunks─────▶          │
  │  ──charging sessions▶          ▼
  │                            InfluxDB 2 ◀── Grafana
- └──live telemetry (optional, direct)──────────────────▶ ABRP
+ └──live telemetry─────▶ ABRP
 ```
 
-With ABRP credentials set in the app (Live data tab), the car sends live data to ABRP itself,
-so ABRP keeps getting it while the server is down; the server then forwards only samples the
-car could not deliver. Without them in the app, the server forwards everything with its own
-ABRP credentials. The car authenticates with the server using a token of its own, obtained by
-pairing with a phone (below).
+The car sends live data to ABRP itself, with the ABRP credentials set on the Live data tab, so
+ABRP and the server do not depend on each other. The server only stores. The car authenticates
+with the server using a token of its own, obtained by pairing with a phone (below).
 
 ## The app
 
@@ -118,8 +116,7 @@ pointed at this repository's releases (see `SPECS.md`).
 3. Tap **Pair with phone**. Scan the QR code with a phone (or open the address shown and enter
    the code), and approve with the server's approval password. The car receives its token.
 4. On the **Live data** tab, turn live data on. The service starts with the car from then on.
-5. Optional: enter your ABRP API key and user token on the same tab, so the car also sends
-   live data straight to ABRP.
+5. Enter your ABRP API key and user token on the same tab, so the car sends live data to ABRP.
 
 ### Config file
 
@@ -141,8 +138,8 @@ installation_id = only to carry over history from an install older than 2.9.0
 interval_sec    = 60      # 15 / 30 / 60 / 120 / 300
 boost_low_soc   = true
 low_soc_percent = 20
-abrp_api_key    = optional: your ABRP API key, to send to ABRP directly
-abrp_token      = optional: your ABRP user token
+abrp_api_key    = your ABRP API key
+abrp_token      = your ABRP user token
 ```
 
 After a successful import the app deletes the file, since it holds the token; credentials live
@@ -182,7 +179,7 @@ work for the plain Gradle builds.
 ## Server and dashboards
 
 - **Server** ([`server/`](server/README.md)): Go, API only. Live telemetry, daily consumption
-  chunks, charging sessions, pairing; forwards live data to ABRP. Image at
+  chunks, charging sessions, pairing. Image at
   `git.stinnesbeck.com/nils/mg4-server`.
 - **Kubernetes** ([`k8s/`](k8s/README.md)): plain manifests for the server, InfluxDB 2 and
   Grafana, applied by hand with `kubectl apply -k k8s/`. Secrets go in the gitignored