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.mjs

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