feat(apps): OBD2 placeholder rail item (launchpad for the parked OBD2 project)

Adds an OBD2 item to the Apps rail; with no records UI deployed yet it links to
the OBD2 Telemetry project + tasks and the research/wiki page rather than
embedding. Swap to embedView once LubeLogger/Tracktor is up. → 2.1.1.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CHANGELOG.md

@@ -3,6 +3,9 @@
 All notable changes to Void 2.0 are documented here.
 Format: [Keep a Changelog](https://keepachangelog.com).
 
+## 2.1.1 — OBD2 Apps rail placeholder
+- **OBD2 Apps rail item** (`public/views/obd2.js`, router/app/sidebar): a placeholder launchpad under **Apps** for the parked OBD2 Telemetry project — links to the project + tasks and the research/wiki page. Swap to an `embedView` once a records UI (LubeLogger/Tracktor) is deployed.
+
 ## 2.1.0 — LAN device discovery
 - **`lan_devices` store + hourly `arp-scan`** (`migration 024`, `lib/infra/scan.js`,
   `lib/db/repos/lan_devices.js`, `lib/cron`): the Devices band is now DB-backed and