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/mercury-mountaineer-4.6-2006.json

@@ -6,7 +6,7 @@
     "model": "Mountaineer",
     "years": "2006",
     "engine": "4.6L SOHC 3-valve Triton V8 (MAF-metered, AWD)",
-    "author": "ford-obd project",
+    "author": "OBDash project",
     "version": "0.1.0",
     "protocol": "SAE J1850 PWM",
     "notes": "UN150 platform, badge-twin of the 4th-gen (2006-2010) Ford Explorer. Uses Ford SCP = SAE J1850 PWM (DLC pins 2 & 10, 41.6 kbps) for SAE J1979 diagnostics \u2014 ELM327 protocol 1. The MS-CAN on this platform is an internal body network (FORScan), not the generic emissions bus; ISO 15765 CAN only arrived for MY2008. MAF-metered, no MAP. Two banks, two narrowband HEGO O2 sensors per bank. No verifiable mode-22 enhanced PIDs for this pre-CAN J1850 PCM, so none included. Mode-01 0142 module voltage omitted (CAN-era PID); use BATT (ATRV)."