Deploy server 2.1.0; keep filled-in secrets out of git

- kustomization pins mg4-server 2.1.0 by digest; server.yaml sets
  PUBLIC_URL for the pairing QR code; the secrets template gains
  APPROVAL_PASSWORD.
- Filled-in Secrets now go into k8s/secrets.yaml, which is gitignored;
  the template stays on placeholders. This follows a leak where real
  values typed into the template were committed and pushed (amended and
  force-pushed since; both values regenerated).
- SPECS.md records pairing and the incident.

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

k8s/README.md

@@ -11,7 +11,8 @@ is applied automatically. Apply them yourself.
 | `grafana.yaml` | Grafana 13.2.3 Deployment (1Gi PVC), Service; datasource and dashboards provisioned |
 | `grafana/` | The provisioned InfluxDB datasource and the MG4 dashboards (Live, Consumption, Charging) |
 | `ingress.yaml` | Traefik `IngressRoute`s for car.stinnesbeck.com and Grafana, TLS from Traefik's default certificate |
-| `secrets.example.yaml` | **Template** for the Secrets; not in `kustomization.yaml` |
+| `secrets.example.yaml` | **Template** for the Secrets; placeholders only, not in `kustomization.yaml` |
+| `secrets.yaml` | Your filled-in copy — **gitignored**, never committed |
 | `kustomization.yaml` | Everything except the Secrets; pins the server image, generates the Grafana ConfigMaps |
 
 ## Before the first apply
@@ -19,9 +20,10 @@ is applied automatically. Apply them yourself.
 1. **Check `ingress.yaml`:** the ingress class (placeholder `traefik-external` for the public
    Traefik) and Grafana's host (placeholder `car-grafana.stinnesbeck.com`). Both hosts must be
    covered by Traefik's default certificate.
-2. **Create the Secrets.** Copy `secrets.example.yaml` outside the repository, replace every
-   `CHANGE-ME` (`openssl rand -hex 32`), then apply the copy: `influxdb-auth`, `mg4-server`
-   (ingest token, your ABRP API key and user token) and `grafana-admin`.
+2. **Create the Secrets.** `cp k8s/secrets.example.yaml k8s/secrets.yaml` (gitignored), replace
+   every `CHANGE-ME` there (`openssl rand -hex 32`): `influxdb-auth`, `mg4-server` (ingest token,
+   approval password for pairing, your ABRP API key and user token) and `grafana-admin`. Keep
+   `secrets.example.yaml` itself on placeholders only.
 3. **Registry access.** The `mg4-server` package on git.stinnesbeck.com is public, so no pull
    secret is needed. If you make it private, add an `imagePullSecrets` entry to `server.yaml`.
 
@@ -29,7 +31,7 @@ is applied automatically. Apply them yourself.
 
 ```sh
 kubectl apply -f k8s/namespace.yaml
-kubectl apply -f <your filled-in secrets file>
+kubectl apply -f k8s/secrets.yaml
 kubectl apply -k k8s/
 ```