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/defaults.js

@@ -0,0 +1,17 @@
+export function defaults(target, ...sources) {
+  for (let source of sources) {
+    for (let k in source) {
+      if (!target?.hasOwnProperty?.(k)) {
+        target[k] = source[k]
+      }
+    }
+
+    for (let k of Object.getOwnPropertySymbols(source)) {
+      if (!target?.hasOwnProperty?.(k)) {
+        target[k] = source[k]
+      }
+    }
+  }
+
+  return target
+}