Rename project to OBDash + per-metric colored multi-axis

Rename: the app is vehicle-agnostic, so 'ford-obd' was wrong. Rebranded all
code/docs/profile authors to OBDash; Gitea repo renamed justin/ford-obd ->
justin/obdash (remote + description updated). Ford the make and the
ford-6.0-powerstroke profile are unchanged (that vehicle really is a Ford).

Multi-axis upgrade (per request):
- MultiAxisPlot now gives each METRIC its own Y axis, each axis colored to
  match its line; the primary metric owns the LEFT axis, others stack right.
- Click a line to promote it to the left axis (sigClicked -> set_primary).
- Cleaner teardown (no removeItem warnings); axis label no longer doubles the
  unit; Normalize round-trips.

Validated headless: colored per-metric axes, promote-to-left, gauge view,
normalize toggle, profile switch; obdcore + diagnostics tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016yT89n4zR4qbrySoSiEyZs

profiles/jeep-wrangler-4.0-1997.json

@@ -6,7 +6,7 @@
     "model": "Wrangler TJ",
     "years": "1997",
     "engine": "4.0L I6 (242 cu in)",
-    "author": "ford-obd project",
+    "author": "OBDash project",
     "version": "0.1.0",
     "protocol": "ISO 9141-2",
     "notes": "Chrysler/Jeep OBD-II over ISO 9141-2 K-line (used by Chrysler/Jeep for generic OBD-II through the early 2000s, later replaced by ISO 15765 CAN; Chrysler never used J1850). Speed-density: MAP sensor, no MAF. Single bank (inline-6): fuel trim bank 1 only, two narrowband O2 sensors (B1S1 upstream, B1S2 post-cat). Generic Mode-01 only; no generic service-22 enhanced channel on this JTEC PCM (Chrysler enhanced data lives on the proprietary SCI bus)."