feat(14.3-01): add summer new with a starter route and relative go.work

- build.NewApp writes sm-<name>-app: go.mod with a relative framework
  replace, go.work, summer.yaml, config/ and a starter plugin
- make:plugin gains an opt-in starter route (GET /{$}) in the same
  routes.go template; plain make:plugin output is unchanged
- plugin:add writes go.work use paths relative to the go.work directory
- bonfire accepts new as a bare tool command name

cmd/summer/main_test.go

@@ -19,7 +19,7 @@ func TestToolCommandNames(t *testing.T) {
 	for _, c := range toolCommands() {
 		names = append(names, c.Name)
 	}
-	for _, want := range []string{"build", "make:plugin", "make:model", "make:migration", "make:command", "make:job", "make:admin-controller", "plugin:add", "dev", "migrate", "migrate:rollback", "migrate:status", "serve", "queue:work", "queue:clear", "schedule:run", "parity:broadcasts", "parity:upstream", "docs:build", "docs:sync", "docs:serve"} {
+	for _, want := range []string{"build", "make:plugin", "make:model", "make:migration", "make:command", "make:job", "make:admin-controller", "plugin:add", "new", "dev", "migrate", "migrate:rollback", "migrate:status", "serve", "queue:work", "queue:clear", "schedule:run", "parity:broadcasts", "parity:upstream", "docs:build", "docs:sync", "docs:serve"} {
 		if !slices.Contains(names, want) {
 			t.Fatalf("missing %s in %v", want, names)
 		}
@@ -27,6 +27,7 @@ func TestToolCommandNames(t *testing.T) {
 
 	helpWants := map[string][]string{
 		"make:plugin":           {"vendor.plugin"},
+		"new":                   {"--framework", "name"},
 		"make:model":            {"[plugin] [name]", "no-migration"},
 		"make:migration":        {"[plugin] [name]"},
 		"make:command":          {"[plugin] [name]"},