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/postcss-import/lib/load-content.js

@@ -0,0 +1,12 @@
+"use strict"
+
+const readCache = require("read-cache")
+const dataURL = require("./data-url")
+
+module.exports = filename => {
+  if (dataURL.isValid(filename)) {
+    return dataURL.contents(filename)
+  }
+
+  return readCache(filename, "utf-8")
+}