Add Buy Me a Coffee link to terminal scan output

Added buymeacoffee.com/gitvet next to contact email in:
- Success scan output (after findings report)
- Error output (when scan fails)

Now shows: "Questions? gitvet@steele.red • buymeacoffee.com/gitvet"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: baocin

internal/githttp/handler.go

@@ -671,7 +671,9 @@ func (h *Handler) writeScanReport(sb *SidebandWriter, report *ReportWriter, pars
 
 	// Contact
 	report.WriteBoxMiddle(width)
-	report.WriteBoxLine(fmt.Sprintf("Questions? %s", sb.Color(Cyan, "gitvet@steele.red")), width)
+	report.WriteBoxLine(fmt.Sprintf("Questions? %s • %s",
+		sb.Color(Cyan, "gitvet@steele.red"),
+		sb.Color(Cyan, "buymeacoffee.com/gitvet")), width)
 	report.WriteBoxBottom(width)
 
 	sb.WriteEmptyLine()
@@ -959,7 +961,9 @@ func (h *Handler) writeFetchError(sb *SidebandWriter, report *ReportWriter, pars
 	}
 
 	report.WriteBoxMiddle(boxWidth)
-	report.WriteBoxLine(sb.Color(Cyan, "Questions? gitvet@steele.red"), boxWidth)
+	report.WriteBoxLine(fmt.Sprintf("Questions? %s • %s",
+		sb.Color(Cyan, "gitvet@steele.red"),
+		sb.Color(Cyan, "buymeacoffee.com/gitvet")), boxWidth)
 	report.WriteBoxBottom(boxWidth)
 	sb.WriteEmptyLine()
 }