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

controllers/api/settings.go

@@ -28,6 +28,7 @@ type UpdateSettingsInput struct {
 	LinksNewTab           *bool                               `json:"links_new_tab,omitempty" jsonschema:"open links to other sites in a new tab (rel=noopener, announced to screen readers); default true"`
 	NofollowDomains       *string                             `json:"nofollow_domains,omitempty" jsonschema:"domains whose links always get nofollow, one per line, e.g. example.com (subdomains included; no https:// and no path)"`
 	SponsoredDomains      *string                             `json:"sponsored_domains,omitempty" jsonschema:"domains whose links always get sponsored, one per line (subdomains included)"`
+	AutolinkMax           *int                                `json:"autolink_max,omitempty" jsonschema:"the most phrases of the auto-link table linked in one text, 0 to 20 (default 3); 0 turns auto-linking off"`
 	VerifyGoogle          *string                             `json:"verify_google,omitempty" jsonschema:"the Google Search Console verification code"`
 	VerifyBing            *string                             `json:"verify_bing,omitempty" jsonschema:"the Bing verification code"`
 	VerifyYandex          *string                             `json:"verify_yandex,omitempty" jsonschema:"the Yandex verification code"`