feat(11.1-05): add the acme.blog walkthrough plugin with its model, migration and posts route

- docs/examples/blog: scaffolder output for acme.blog (make:plugin, make:model)
  in the root module, with a Post model, a fill allow-list and NewPost, the
  create migration and GET /api/blog/posts paginated through lagoon
- short tests activate the plugin, check the route with surf, the fill
  allow-list and the migration order
- docs/setup/porting-a-plugin.md: registration, model, migrations and routes
  sections with src= copies of the plugin
- TestDocsRequiredPages requires setup/porting-a-plugin

docs/examples/blog/registry.gen.go

@@ -0,0 +1,35 @@
+// Code generated by summer make. DO NOT EDIT.
+
+package blog
+
+import (
+	"git.golem15.com/golem15/summercms/docs/examples/blog/models"
+	"git.golem15.com/golem15/summercms/docs/examples/blog/updates"
+	"git.golem15.com/golem15/summercms/modules/bonfire"
+	"git.golem15.com/golem15/summercms/modules/pact"
+	"github.com/go-gormigrate/gormigrate/v2"
+)
+
+func generatedModels() []any {
+	return []any{
+		&models.Post{},
+	}
+}
+
+func generatedMigrations() []*gormigrate.Migration {
+	return []*gormigrate.Migration{
+		updates.CreatePosts(),
+	}
+}
+
+func generatedCommands() []bonfire.Command {
+	return nil
+}
+
+func generatedJobs() []pact.Job {
+	return nil
+}
+
+func generatedAdminControllers() []pact.AdminController {
+	return nil
+}