feat: management API and an MCP tool per SEO admin operation

- /_seo/api/v1 routes for the effective SEO of a URL with sources and
  owner, URL rules, redirects (loops refused with redirect_loop), the
  404 log actions, robots.txt and its tester, settings and history
- the CMS-data issue report: missing and duplicate titles and
  descriptions, rules over records, redirect chains, canonicals to
  noindex or redirected addresses, noindex addresses robots.txt blocks
- 24 MCP tools on those routes (backend guard, golem15.seo.manage)
- AdminOperations maps every admin operation to its tool;
  TestEveryAdminOperationHasTool and TestMCPReadToolsAreGET guard drift
- robots.txt writes go through classes.SaveRobots from the admin too

extensions_robots.go

@@ -4,9 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"strconv"
 	"strings"
-	"time"
 
 	"git.golem15.com/golem15/sm-seo-plugin/classes"
 	"git.golem15.com/golem15/sm-seo-plugin/controllers"
@@ -116,43 +114,24 @@ func (p *Plugin) robotsForm() *pact.AdminFormExtension {
 			if svc == nil {
 				return pact.AdminFormSaveResult{}, classes.ErrNotBooted
 			}
-			row, ok := in.Record.(*models.Robots)
-			if !ok || row == nil {
+			if row, ok := in.Record.(*models.Robots); !ok || row == nil {
 				return pact.AdminFormSaveResult{}, nil
 			}
-			before := robotsValues(*row)
+			var w classes.RobotsWrite
 			if raw, ok := in.Values["content"]; ok {
 				if text, ok := raw.(string); ok {
-					row.Content = text
+					w.Content = &text
 				}
 			}
-			bots := models.BotSwitches{}
-			for token, on := range row.Bots {
-				bots[token] = on
-			}
 			for _, b := range classes.Bots {
 				if raw, ok := in.Values[classes.BotField(b.Token)]; ok {
-					bots[b.Token] = truthy(raw)
+					if w.Bots == nil {
+						w.Bots = map[string]bool{}
+					}
+					w.Bots[b.Token] = truthy(raw)
 				}
 			}
-			row.Bots = bots
-			now := time.Now().UTC()
-			row.UpdatedAt = &now
-			if err := in.DB.Model(&models.Robots{}).Where("id = ?", row.ID).Updates(map[string]any{
-				"content": row.Content, "bots": row.Bots, "updated_at": now,
-			}).Error; err != nil {
-				return pact.AdminFormSaveResult{}, err
-			}
-			if err := svc.Record(ctx, in.DB, classes.Change{
-				Kind:      models.SubjectRobots,
-				SubjectID: strconv.FormatUint(uint64(row.ID), 10),
-				What:      svc.Phrase("golem15.seo::lang.history.what_robots", nil),
-				Before:    before,
-				After:     robotsValues(*row),
-			}); err != nil {
-				return pact.AdminFormSaveResult{}, err
-			}
-			blocked, err := svc.BlockedNoindex(in.DB, row.Content, row.Bots)
+			_, blocked, err := svc.SaveRobots(ctx, in.DB, w)
 			if err != nil || len(blocked) == 0 {
 				return pact.AdminFormSaveResult{}, err
 			}
@@ -169,15 +148,6 @@ func (p *Plugin) robotsForm() *pact.AdminFormExtension {
 	}
 }
 
-// robotsValues are the robots row's values for history.
-func robotsValues(r models.Robots) map[string]any {
-	bots := map[string]any{}
-	for _, b := range classes.Bots {
-		bots[b.Token] = r.Bots.Allowed(b.Token)
-	}
-	return map[string]any{"content": r.Content, "bots": bots}
-}
-
 // robotsTestPayload is the tester's request: op context answers the
 // crawler list and the environment; op test answers whether agent may
 // fetch url under the editor's unsaved text and switches.