Add preflight category styling and mappings

Introduce a new 'preflight' category and wire it through the UI and service logic. Updates:
- public/static/css/error-analysis.css: add .category-badge styles (preflight, proxmox, service, database, shell, build) to provide consistent color badges.
- public/static/js/error-analysis.js: add 'preflight' color to catColors so the UI can render the new category.
- service.go: register 'preflight' as a known category and reclassify exit codes 103–108 from various categories to 'preflight' (these are validation/initial checks).

This groups validation-related errors under a single category for clearer display and handling in the frontend.

public/static/css/error-analysis.css

@@ -475,6 +475,36 @@ tr:hover td {
   color: var(--text-muted);
 }
 
+.category-badge.preflight {
+  background: rgba(20, 184, 166, 0.15);
+  color: #14b8a6;
+}
+
+.category-badge.proxmox {
+  background: rgba(245, 158, 11, 0.15);
+  color: #f59e0b;
+}
+
+.category-badge.service {
+  background: rgba(6, 182, 212, 0.15);
+  color: #06b6d4;
+}
+
+.category-badge.database {
+  background: rgba(139, 92, 246, 0.15);
+  color: #8b5cf6;
+}
+
+.category-badge.shell {
+  background: rgba(251, 146, 60, 0.15);
+  color: #fb923c;
+}
+
+.category-badge.build {
+  background: rgba(217, 70, 239, 0.15);
+  color: #d946ef;
+}
+
 .charts-grid {
   display: grid;
   grid-template-columns: 1fr 1fr;

public/static/js/error-analysis.js

@@ -9,7 +9,8 @@ const catColors = {
   'storage': '#ec4899', 'resource': '#f97316', 'dependency': '#22d3ee',
   'signal': '#eab308', 'config': '#84cc16', 'unknown': '#64748b',
   'uncategorized': '#94a3b8', 'service': '#06b6d4', 'database': '#8b5cf6',
-  'proxmox': '#f59e0b', 'shell': '#fb923c', 'build': '#d946ef'
+  'proxmox': '#f59e0b', 'shell': '#fb923c', 'build': '#d946ef',
+  'preflight': '#14b8a6'
 };
 
 function escapeHtml(str) {

service.go

@@ -1009,7 +1009,7 @@ var (
 		"timeout": true, "config": true, "resource": true, "unknown": true, "": true,
 		"user_aborted": true, "apt": true, "command_not_found": true,
 		"service": true, "database": true, "signal": true, "proxmox": true,
-		"shell": true, "build": true,
+		"shell": true, "build": true, "preflight": true,
 	}
 
 	// exitCodeInfo consolidates description and category for all known exit codes.
@@ -1081,12 +1081,12 @@ var (
 		102: {"APT: Lock held by another process", "apt"},
 
 		// --- Script Validation & Setup (103-123) ---
-		103: {"Validation: Shell is not Bash", "config"},
-		104: {"Validation: Not running as root", "permission"},
-		105: {"Validation: PVE version not supported", "config"},
-		106: {"Validation: Architecture not supported (ARM/PiMox)", "config"},
-		107: {"Validation: Kernel key parameters unreadable", "config"},
-		108: {"Validation: Kernel key limits exceeded", "config"},
+		103: {"Validation: Shell is not Bash", "preflight"},
+		104: {"Validation: Not running as root", "preflight"},
+		105: {"Validation: PVE version not supported", "preflight"},
+		106: {"Validation: Architecture not supported (ARM/PiMox)", "preflight"},
+		107: {"Validation: Kernel key parameters unreadable", "preflight"},
+		108: {"Validation: Kernel key limits exceeded", "preflight"},
 		109: {"Proxmox: No available container ID", "proxmox"},
 		110: {"Proxmox: Failed to apply default.vars", "proxmox"},
 		111: {"Proxmox: App defaults file not available", "proxmox"},