refactor: address code review findings across all projects

Apply comprehensive fixes from code reviews including:
- Extract shared utilities (SqlFormatHelper, CellValueConverter, DbDestinationBase)
- Add interface abstractions (IAuthenticationService, IDatabaseMigrator, IMisQueryBuilder)
- Implement SecureStore for encrypted secrets storage
- Fix error handling with proper HTTP status codes and logging
- Optimize double enumeration in DevEtlRegistry
- Add DataSync.Dev README for developer onboarding
- Extract filter panel base classes to reduce duplication
- Update code review docs to mark all issues as fixed

NEW/src/JdeScoping.Client/Components/Admin/SqlQueryModal.razor

@@ -1,4 +1,5 @@
 @namespace JdeScoping.Client.Components.Admin
+@using JdeScoping.Client.Helpers
 @inject IJSRuntime JS
 
 @if (Visible)
@@ -83,55 +84,7 @@
     [Parameter] public string? Title { get; set; }
     [Parameter] public string? Sql { get; set; }
 
-    private string FormattedSql => FormatSql(Sql);
-
-    private static string FormatSql(string? sql)
-    {
-        if (string.IsNullOrWhiteSpace(sql))
-            return "";
-
-        // Format SELECT columns - put each column on its own line
-        var result = FormatSelectColumns(sql);
-
-        // Add line breaks before major clauses
-        result = result
-            .Replace(" FROM ", "\nFROM ")
-            .Replace(" WHERE ", "\nWHERE ")
-            .Replace(" AND ", "\n  AND ")
-            .Replace(" OR ", "\n  OR ")
-            .Replace(" LEFT ", "\nLEFT ")
-            .Replace(" RIGHT ", "\nRIGHT ")
-            .Replace(" INNER ", "\nINNER ")
-            .Replace(" OUTER ", "\nOUTER ")
-            .Replace(" JOIN ", " JOIN\n  ")
-            .Replace(" ORDER BY ", "\nORDER BY ")
-            .Replace(" GROUP BY ", "\nGROUP BY ")
-            .Replace(" HAVING ", "\nHAVING ");
-
-        return result.Trim();
-    }
-
-    private static string FormatSelectColumns(string sql)
-    {
-        // Find SELECT and FROM positions (case-insensitive)
-        var selectIndex = sql.IndexOf("SELECT", StringComparison.OrdinalIgnoreCase);
-        var fromIndex = sql.IndexOf(" FROM ", StringComparison.OrdinalIgnoreCase);
-
-        if (selectIndex < 0 || fromIndex < 0 || fromIndex <= selectIndex)
-            return sql;
-
-        var beforeSelect = sql[..selectIndex];
-        var selectKeyword = sql.Substring(selectIndex, 6); // "SELECT"
-        var columnsStart = selectIndex + 6;
-        var columns = sql[columnsStart..fromIndex];
-        var afterColumns = sql[fromIndex..];
-
-        // Split columns by comma and rejoin with newlines
-        var columnList = columns.Split(',');
-        var formattedColumns = string.Join(",\n       ", columnList.Select(c => c.Trim()));
-
-        return $"{beforeSelect}{selectKeyword} {formattedColumns}{afterColumns}";
-    }
+    private string FormattedSql => SqlFormatHelper.FormatSql(Sql);
 
     private async Task CopyToClipboard()
     {