feat: auto-link phrases in the resolve answer (tracer)

- golem15_seo_autolinks (migration 202610280007) and the settings column
  autolink_max (Links tab, 0 to 20, default 3)
- classes/autolinks.go: checked save and delete with history, ForPage
- ok resolve answers carry autolinks for the page's locale without
  disabled phrases and links to the page itself, and autolink_max

models/revision.go

@@ -25,6 +25,8 @@ const (
 	SubjectNotFound = "notfound"
 	// SubjectPage is a page of the page registry (D-33).
 	SubjectPage = "page"
+	// SubjectAutolink is a phrase of the auto-link table (D-82).
+	SubjectAutolink = "autolink"
 )
 
 // Revision is one recorded SEO change on golem15_seo_revisions (D-13): who