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/ford-6.0-powerstroke.json

@@ -6,7 +6,7 @@
     "model": "Super Duty / Excursion",
     "years": "2003-2007",
     "engine": "6.0L Power Stroke diesel",
-    "author": "ford-obd project",
+    "author": "OBDash project",
     "version": "1.1.0",
     "protocol": "auto",
     "notes": "PID addresses + scaling corrected/verified by the ford-60-pid-hunt workflow (2026-06-29) and on-truck reads (2026-06-30). confidence: verified = multi-source or read on a real 6.0; doc = corroborated in sources, not yet read on-vehicle; tentative = single-source / disputed scaling. ICP_DES (desired ICP) has no public Mode-22 DID -> FORScan-only, not included."