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/mz/zlib.js

@@ -0,0 +1,13 @@
+
+require('thenify-all').withCallback(
+  require('zlib'),
+  exports, [
+    'deflate',
+    'deflateRaw',
+    'gzip',
+    'gunzip',
+    'inflate',
+    'inflateRaw',
+    'unzip',
+  ]
+)