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>

Models/BenchConfiguration.cs

@@ -166,14 +166,5 @@ namespace HC_APTBS.Models
         /// <summary>Active alarm definitions loaded from alarms.xml.</summary>
         public List<Alarm> Alarms { get; set; } = new();
 
-        // ── Clients ───────────────────────────────────────────────────────────
-
-        /// <summary>Client/operator database, keyed by name (sorted).</summary>
-        public SortedDictionary<string, string> Clients { get; set; } = new();
-
-        // ── Pump IDs ──────────────────────────────────────────────────────────
-
-        /// <summary>List of known pump identifiers available in the database.</summary>
-        public List<string> PumpIds { get; set; } = new();
     }
 }