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/clsx/dist/clsx.js

@@ -0,0 +1 @@
+function r(e){var o,t,f="";if("string"==typeof e||"number"==typeof e)f+=e;else if("object"==typeof e)if(Array.isArray(e)){var n=e.length;for(o=0;o<n;o++)e[o]&&(t=r(e[o]))&&(f&&(f+=" "),f+=t)}else for(t in e)e[t]&&(f&&(f+=" "),f+=t);return f}function e(){for(var e,o,t=0,f="",n=arguments.length;t<n;t++)(e=arguments[t])&&(o=r(e))&&(f&&(f+=" "),f+=o);return f}module.exports=e,module.exports.clsx=e;