perf: source statistics from the catalog

src/adminStatsWorker.js

@@ -1,5 +1,7 @@
 const { parentPort, workerData } = require('node:worker_threads');
 const Database = require('better-sqlite3');
+const fs = require('node:fs');
+const path = require('node:path');
 
 try {
   const db = new Database(workerData.databasePath, { readonly: true, fileMustExist: true });
@@ -12,9 +14,10 @@ try {
       (SELECT COUNT(*) FROM articles WHERE ingested_at >= datetime('now', '-1 hour')) AS ingestedPerHour,
       (SELECT COUNT(*) FROM article_embedding_meta WHERE embedded_at >= datetime('now', '-1 hour')) AS contentPerHour
   `).get();
-  const bySource = db.prepare(`
-    SELECT DISTINCT source FROM articles ORDER BY source
-  `).all();
+  const sourceCatalog = JSON.parse(fs.readFileSync(path.resolve(__dirname, '..', 'sources.json'), 'utf8'));
+  const bySource = sourceCatalog
+    .map((source) => ({ source: source.label || source.id }))
+    .sort((a, b) => a.source.localeCompare(b.source));
   // Avoid scanning the 3.7 GB article table for legacy content-status values.
   // Readiness is the useful operational distinction and is available from the
   // compact embedding metadata table.