feat: robust metric extraction with confidence score and proof snippets

- fixed Year-Prefix Bug in MetricParser
- added metric_confidence and metric_proof_text to database
- added Entity-Check and Annual-Priority to LLM prompt
- improved UI: added confidence traffic light and mouse-over proof tooltip
- restored missing API endpoints (create, bulk, wiki-override)

company-explorer/frontend/node_modules/axios/lib/helpers/parseProtocol.js

@@ -0,0 +1,6 @@
+'use strict';
+
+export default function parseProtocol(url) {
+  const match = /^([-+\w]{1,25})(:?\/\/|:)/.exec(url);
+  return match && match[1] || '';
+}