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/settings.go

@@ -179,6 +179,10 @@ type Settings struct {
 	LinksNewTab      bool   `gorm:"column:links_new_tab"`
 	NofollowDomains  string `gorm:"column:nofollow_domains"`
 	SponsoredDomains string `gorm:"column:sponsored_domains"`
+	// AutolinkMax is the most phrases of SEO › Auto-links linked in one
+	// text (Links tab, 0 to 20, 3 by default); 0 turns auto-linking off
+	// (D-82).
+	AutolinkMax int `gorm:"column:autolink_max"`
 	// BreadcrumbHome is the home crumb's name (translatable; empty: the
 	// per-locale default copy).
 	BreadcrumbHome string `gorm:"column:breadcrumb_home"`
@@ -247,7 +251,7 @@ func (Settings) Fillable() []string {
 		"local_region", "local_country", "local_latitude", "local_longitude",
 		"local_hours", "page_form", "page_segment", "page_title_suffix",
 		"page_description_suffix", "crawl_schedule", "crawl_max_pages",
-		"crawl_delay", "crawl_keep", "generic_anchors",
+		"crawl_delay", "crawl_keep", "generic_anchors", "autolink_max",
 	}
 }
 
@@ -264,6 +268,7 @@ func DefaultSettings() Settings {
 		URLHost:        HostKeep,
 		URLSlash:       SlashKeep,
 		LinksNewTab:    true,
+		AutolinkMax:    DefaultAutolinkMax,
 		PageForm:       PageFormQuery,
 		PublisherType:  PublisherOrganization,
 		LocalType:      DefaultLocalType,
@@ -299,9 +304,9 @@ const (
 // pl lists of UI-SPEC C27, one per line.
 const DefaultGenericAnchors = "click here\nhere\nmore\nread more\nlearn more\nthis link\nlink\nkliknij tutaj\ntutaj\ntu\nwięcej\nczytaj więcej\nczytaj dalej\nten link"
 
-// AuditProblems refuses Site audit values outside their ranges
-// (lagoon::validation.between.numeric, UI-SPEC C20) and an unknown
-// schedule. The settings screen and the API check it on save; Problems
+// AuditProblems refuses Site audit values and the Links tab's
+// autolink_max outside their ranges (lagoon::validation.between.numeric,
+// UI-SPEC C20) and an unknown schedule. The settings screen and the API check it on save; Problems
 // leaves it out, so a partial Settings value checks its templates only.
 func (s Settings) AuditProblems() map[string][]Problem {
 	out := map[string][]Problem{}
@@ -315,6 +320,7 @@ func (s Settings) AuditProblems() map[string][]Problem {
 	between("crawl_max_pages", s.CrawlMaxPages, MinCrawlMaxPages, MaxCrawlMaxPages)
 	between("crawl_delay", s.CrawlDelay, MinCrawlDelay, MaxCrawlDelay)
 	between("crawl_keep", s.CrawlKeep, MinCrawlKeep, MaxCrawlKeep)
+	between("autolink_max", s.AutolinkMax, MinAutolinkMax, MaxAutolinkMax)
 	switch s.CrawlSchedule {
 	case CrawlOff, CrawlDaily, CrawlWeekly:
 	default: