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/tailwindcss/src/util/negateValue.js

@@ -0,0 +1,24 @@
+export default function negateValue(value) {
+  value = `${value}`
+
+  if (value === '0') {
+    return '0'
+  }
+
+  // Flip sign of numbers
+  if (/^[+-]?(\d+|\d*\.\d+)(e[+-]?\d+)?(%|\w+)?$/.test(value)) {
+    return value.replace(/^[+-]?/, (sign) => (sign === '-' ? '' : '-'))
+  }
+
+  // What functions we support negating numeric values for
+  // var() isn't inherently a numeric function but we support it anyway
+  // The trigonometric functions are omitted because you'll need to use calc(…) with them _anyway_
+  // to produce generally useful results and that will be covered already
+  let numericFunctions = ['var', 'calc', 'min', 'max', 'clamp']
+
+  for (const fn of numericFunctions) {
+    if (value.includes(`${fn}(`)) {
+      return `calc(${value} * -1)`
+    }
+  }
+}