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/cloneDeep.js

@@ -0,0 +1,11 @@
+export function cloneDeep(value) {
+  if (Array.isArray(value)) {
+    return value.map((child) => cloneDeep(child))
+  }
+
+  if (typeof value === 'object' && value !== null) {
+    return Object.fromEntries(Object.entries(value).map(([k, v]) => [k, cloneDeep(v)]))
+  }
+
+  return value
+}