fix: resolve API route name collisions

- DrawingsController: rename 'name/{name}' to 'by-name/{name}' to
  eliminate ambiguous match with '{name}/dxf' on path /drawings/name/dxf
- NestsController: add regex constraint to '{nestName}/download' and
  '{nestName}/plates' to prevent collision with year-parameterized routes
  when nestName is a 4-digit integer
- PepMcp/PepTools.cs: update GetDrawingByName URL to match renamed route

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

PepMcp/PepTools.cs

@@ -533,7 +533,7 @@ public class PepTools
     {
         try
         {
-            var response = await _httpClient.GetAsync($"/drawings/name/{Uri.EscapeDataString(name)}");
+            var response = await _httpClient.GetAsync($"/drawings/by-name/{Uri.EscapeDataString(name)}");
 
             if (!response.IsSuccessStatusCode)
                 return $"Error: {response.StatusCode} - {await response.Content.ReadAsStringAsync()}";