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/tailwindcss/src/util/escapeClassName.js

@@ -0,0 +1,8 @@
+import parser from 'postcss-selector-parser'
+import escapeCommas from './escapeCommas'
+
+export default function escapeClassName(className) {
+  let node = parser.className()
+  node.value = className
+  return escapeCommas(node?.raws?.value ?? node.value)
+}