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/tailwind-merge/src/lib/config-utils.ts

@@ -0,0 +1,12 @@
+import { createClassGroupUtils } from './class-group-utils'
+import { createLruCache } from './lru-cache'
+import { createParseClassName } from './parse-class-name'
+import { AnyConfig } from './types'
+
+export type ConfigUtils = ReturnType<typeof createConfigUtils>
+
+export const createConfigUtils = (config: AnyConfig) => ({
+    cache: createLruCache<string, string>(config.cacheSize),
+    parseClassName: createParseClassName(config),
+    ...createClassGroupUtils(config),
+})