Add GPU serial number extraction for NVIDIA diagnostics

Parse inventory/output.log to extract GPU serial numbers from lspci output,
expose them via serials API, and add GPU category to web UI.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

internal/parser/vendors/nvidia/parser.go

@@ -14,7 +14,7 @@ import (
 
 // parserVersion - version of this parser module
 // IMPORTANT: Increment this version when making changes to parser logic!
-const parserVersion = "1.1.0"
+const parserVersion = "1.2.0"
 
 func init() {
 	parser.Register(&Parser{})
@@ -124,6 +124,15 @@ func (p *Parser) Parse(files []parser.ExtractedFile) (*models.AnalysisResult, er
 		}
 	}
 
+	// Parse inventory/output.log (contains GPU serial numbers from lspci)
+	inventoryLogFile := findInventoryOutputLog(files)
+	if inventoryLogFile != nil {
+		if err := ParseInventoryLog(inventoryLogFile.Content, result); err != nil {
+			// Log error but continue parsing other files
+			_ = err // Ignore error for now
+		}
+	}
+
 	// Parse summary.json (test results summary)
 	if f := parser.FindFileByName(files, "summary.json"); f != nil {
 		events := ParseSummaryJSON(f.Content)