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/nesting/index.d.ts

@@ -0,0 +1,4 @@
+import type { AcceptedPlugin, PluginCreator } from 'postcss'
+
+declare const plugin: PluginCreator<AcceptedPlugin | string | void>
+export = plugin

company-explorer/frontend/node_modules/tailwindcss/nesting/index.js

@@ -0,0 +1,2 @@
+let nesting = require('../lib/postcss-plugins/nesting')
+module.exports = (nesting.__esModule ? nesting : { default: nesting }).default