feat(15-02): add Categories, Tags, and journal settings admin

Register the remaining YAML admin screens and the settings singleton
so a host can boot Posts, Categories, Tags, and Code journal. Posts
update and delete refuse other authors without access_other_posts.

Co-authored-by: Cursor <cursoragent@cursor.com>

admin.go

@@ -5,6 +5,7 @@ import (
 	"io/fs"
 
 	"git.golem15.com/golem15/sm-journal-plugin/controllers"
+	"git.golem15.com/golem15/sm-journal-plugin/models"
 	"git.golem15.com/golem15/summercms/modules/backpack"
 	"git.golem15.com/golem15/summercms/modules/pact"
 )
@@ -13,6 +14,9 @@ import (
 // directory also holds Go sources that are not admin assets.
 //
 //go:embed controllers/posts/config_list.yaml controllers/posts/config_form.yaml controllers/posts/config_filter.yaml models/post/fields.yaml models/post/columns.yaml
+//go:embed controllers/categories/config_list.yaml controllers/categories/config_form.yaml models/category/fields.yaml models/category/columns.yaml
+//go:embed controllers/tags/config_list.yaml controllers/tags/config_form.yaml models/tag/fields.yaml models/tag/columns.yaml
+//go:embed models/settings/fields.yaml
 //go:embed assets/images/journal-icon.svg
 var adminFS embed.FS
 
@@ -29,9 +33,23 @@ func (p *Plugin) AdminControllers() []pact.AdminController {
 	})
 }
 
+func (p *Plugin) Settings() []pact.SettingsItem {
+	return []pact.SettingsItem{{
+		Code:        "journal",
+		Label:       "golem15.journal::lang.journal.menu_label",
+		Description: "golem15.journal::lang.journal.settings_description",
+		Category:    "golem15.journal::lang.journal.menu_label",
+		Icon:        "icon-pencil",
+		Permissions: []string{"golem15.journal.manage_settings"},
+		Form:        "models/settings/fields.yaml",
+		NewModel:    func() any { return &models.Settings{} },
+	}}
+}
+
 var (
 	_ pact.AdminAssets         = (*Plugin)(nil)
 	_ pact.HasAdminControllers = (*Plugin)(nil)
 	_ pact.HasPermissions      = (*Plugin)(nil)
 	_ pact.HasNavigation       = (*Plugin)(nil)
+	_ pact.HasSettings         = (*Plugin)(nil)
 )