feat: implement SavePump/SaveAlarms, fix config round-trip bugs, redesign PDF reports

Config system fixes:
- Implement SavePump() — full XML serialization with insert/update by pump ID
- Add CanBusParameter.ToPumpXml() for legacy P1-P6 pump param format
- Fix LastRotationDirection never loaded in LoadSettings()
- Add SaveAlarms() to ConfigurationService and IConfigurationService
- Remove dead fields AppSettings.Clients and AppSettings.PumpIds

PDF report redesign:
- Professional layout with charts, verdict badges, and tolerance bands
- Add ReportChartRenderer (SVG) and ReportTheme styling constants
- Embed default_logo.png as fallback report logo

Documentation:
- Add gap analysis docs (config validation, ford unlock, missing features)
- Update CLAUDE.md architecture, known gaps, and debt tracking

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

HC_APTBS.csproj

@@ -43,6 +43,11 @@
     <PackageReference Include="ToggleSwitch" Version="1.2.0" />
   </ItemGroup>
 
+  <!-- Embedded images — default report logo fallback -->
+  <ItemGroup>
+    <EmbeddedResource Include="Resources\Images\default_logo.png" />
+  </ItemGroup>
+
   <!-- Native DLLs — must sit next to the executable at runtime -->
   <ItemGroup>
     <Content Include="Resources\Native\PCANBasic.dll">