fix(inspur): match main board FRU on word boundary

A bare "board" substring test let compound module names like
"FANBOARD0_FRU" qualify as the main system board, overwriting the
real board info with fan-board serial/part numbers. Switch to a
word-boundary regex.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/parser/vendors/inspur/fru.go

@@ -12,6 +12,9 @@ var (
 	fruDeviceRegex  = regexp.MustCompile(`^FRU Device Description\s*:\s*(.+)$`)
 	fruFieldRegex   = regexp.MustCompile(`^\s+(.+?)\s*:\s*(.*)$`)
 	platformIdRegex = regexp.MustCompile(`(?i)PlatformId\s*=\s*(\S+)`)
+	// Word-boundary match so compound module names like "FANBOARD0_FRU" don't
+	// falsely qualify as the main system board via a bare "board" substring.
+	mainBoardDescRegex = regexp.MustCompile(`(?i)\b(builtin|fru device|chassis|board)\b`)
 )
 
 // ParseFRU parses BMC FRU (Field Replaceable Unit) output
@@ -120,11 +123,7 @@ func extractBoardInfo(fruList []models.FRUInfo, hw *models.HardwareConfig) {
 		}
 
 		// Prioritize entries that look like main board info
-		desc := strings.ToLower(fru.Description)
-		isMainBoard := strings.Contains(desc, "builtin") ||
-			strings.Contains(desc, "fru device") ||
-			strings.Contains(desc, "chassis") ||
-			strings.Contains(desc, "board")
+		isMainBoard := mainBoardDescRegex.MatchString(fru.Description)
 
 		if fru.SerialNumber != "" && hw.BoardInfo.SerialNumber == "" {
 			hw.BoardInfo.SerialNumber = fru.SerialNumber