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/clsx.d.ts

@@ -0,0 +1,10 @@
+declare namespace clsx {
+	type ClassValue = ClassArray | ClassDictionary | string | number | bigint | null | boolean | undefined;
+	type ClassDictionary = Record<string, any>;
+	type ClassArray = ClassValue[];
+	function clsx(...inputs: ClassValue[]): string;
+}
+
+declare function clsx(...inputs: clsx.ClassValue[]): string;
+
+export = clsx;