feat: import leftover student fields into notes and show them on the roster

Store leftover CSV columns on hidden student notes, move catalog import to /events/import, and persist Students index columns from Chapter Settings.

Co-authored-by: Cursor <cursoragent@cursor.com>

Core/Parsers/StudentEventRankingParser.cs

@@ -6,7 +6,6 @@ namespace Core.Parsers;
 
 public class StudentEventRankingParser : CsvParserBase
 {
-    public const int StudentMatchThreshold = 90;
     public const int EventMatchThreshold = 70;
     public const int EventAmbiguityGap = 8;
 
@@ -60,7 +59,7 @@ public class StudentEventRankingParser : CsvParserBase
             if (string.IsNullOrEmpty(name))
                 continue;
 
-            var studentMatch = FindStudent(students, name);
+            var studentMatch = FuzzyStudentMatcher.Find(students, name);
             if (studentMatch is null)
             {
                 result.Issues.Add(new StudentEventRankingIssue
@@ -172,23 +171,6 @@ public class StudentEventRankingParser : CsvParserBase
         return result;
     }
 
-    private static (Student Student, int Score)? FindStudent(ICollection<Student> students, string name)
-    {
-        var ranked = students
-            .Select(s => (Student: s, Score: ScoreStudent(s, name)))
-            .Where(x => x.Score >= StudentMatchThreshold)
-            .OrderByDescending(x => x.Score)
-            .ToList();
-
-        return ranked.Count == 0 ? null : ranked[0];
-    }
-
-    private static int ScoreStudent(Student student, string name)
-    {
-        var candidates = new[] { student.Name, student.FirstNameLastName, student.LastNameFirstName };
-        return candidates.Max(candidate => Math.Max(Fuzz.Ratio(candidate, name), Fuzz.TokenSetRatio(candidate, name)));
-    }
-
     private static EventResolution ResolveEvent(ICollection<EventDefinition> events, string eventName)
     {
         var scored = events