fix(pubmed): correct ESearch sort parameter values

- search.ts: PDAT → pub_date, Journal → JournalName
- author.ts: PDAT → pub_date

Author: WorkBuddy

clis/pubmed/author.ts

@@ -113,7 +113,7 @@ cli({
     // Map sort options
     const sortMap: Record<string, string> = {
       relevance: '',
-      date: 'PDAT',
+      date: 'pub_date',
     };
     const sort = sortMap[args.sort] || '';
 

clis/pubmed/search.ts

@@ -132,9 +132,9 @@ cli({
     // Map sort options to E-utilities sort values
     const sortMap: Record<string, string> = {
       relevance: '',
-      date: 'PDAT',
+      date: 'pub_date',
       author: 'Author',
-      journal: 'Journal',
+      journal: 'JournalName',
     };
     const sort = sortMap[args.sort] || '';