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/autoprefixer/lib/vendor.js

@@ -0,0 +1,14 @@
+module.exports = {
+  prefix(prop) {
+    let match = prop.match(/^(-\w+-)/)
+    if (match) {
+      return match[0]
+    }
+
+    return ''
+  },
+
+  unprefixed(prop) {
+    return prop.replace(/^-\w+-/, '')
+  }
+}