refactor(packages): dissolve ui/ and rename sdk/ to scaffold/

git mv per the regrouping RFC: the five human-collaboration seams and
tui join packages/interaction/, app-boot becomes packages/boot/, and
jsonrpc joins the renamed scaffold/ (formerly sdk/) as its server half
beside client/protocol/create-sdk/helper/scripts/telemetry, whose
folders drop the legacy sdk- prefix. Three new group README triplets
replace the ui/ and sdk/ ones; tsconfig references/paths/globs,
knip keys, vitest globs, gate scripts, catalogs, docs, and the
lockfile follow. Adds the four settled FIXME rename markers
(dsh-sdk-server, dsh-sdk-telemetry, dsh-sdk-helper, dsh-sdk-scripts).

The scaffold folders diverge from their npm names until those renames
land, so tsconfig.base.json maps the three affected names explicitly
beside the group wildcard. Also repairs two pre-existing stale-path
classes the strengthened sweep surfaced: docs/web-styling.md's retired
web-ui host package and type-model spec fixture-literal joins.

app-boot's three Loader-composition specs time out at the default 5s
under full-suite parallel load on this filesystem (pre-existing;
pass isolated with --testTimeout=30000); interaction/scaffold/boot
suites otherwise green (687 passed).

packages/scaffold/create-sdk/src/templates/assets/created.txt.tpl

@@ -0,0 +1 @@
+Created {{name}} in {{directory}}

packages/scaffold/create-sdk/src/templates/assets/install-question.txt.tpl

@@ -0,0 +1 @@
+Run {{packageManager}} {{installArgs}} and then build the project?

packages/scaffold/create-sdk/src/templates/assets/next-steps.txt.tpl

@@ -0,0 +1,5 @@
+{{#if setupRequired}}
+Next: cd {{directory}} && {{packageManager}} {{installArgs}} && {{packageManager}} {{buildArgs}} && {{packageManager}} start
+{{else}}
+Next: cd {{directory}} && {{packageManager}} start
+{{/if}}

packages/scaffold/create-sdk/src/templates/assets/setup-failure.txt.tpl

@@ -0,0 +1,2 @@
+Project files are ready, but setup failed: {{error}}
+Retry: cd {{directory}} && {{packageManager}} {{installArgs}} && {{packageManager}} {{buildArgs}}

packages/scaffold/create-sdk/src/templates/assets/usage.txt.tpl

@@ -0,0 +1,14 @@
+Usage: create-sdk [directory] [options]
+
+Options:
+  --description <text>
+  --provider <deepseek-official|custom>
+  --base-url <url>
+  --api-key <key>
+  --model <name>
+  --interface <acp|embed>
+  --pm <npm|pnpm|yarn>
+  --install / --no-install
+  --config <path>
+  --config-json <json>
+  --json

packages/scaffold/create-sdk/src/templates/create-templates.ts

@@ -0,0 +1,59 @@
+/**
+ * Package-owned terminal templates for create-sdk.
+ *
+ * @module @deepseek-ai/create-sdk/templates/create-templates
+ */
+
+import {
+  TextTemplate,
+  type PackageManager,
+  type PackageManagerName,
+} from '@deepseek-ai/dsh-helper'
+
+interface CreatedTemplateModel {
+  name: string
+  directory: string
+}
+
+interface NextStepsTemplateModel extends PackageManagerTemplateModel {
+  directory: string
+  setupRequired: boolean
+}
+
+interface SetupFailureTemplateModel extends PackageManagerTemplateModel {
+  directory: string
+  error: string
+}
+
+/** Package-manager execution data consumed by create-sdk templates. */
+export interface PackageManagerTemplateModel {
+  packageManager: PackageManagerName
+  installArgs: string
+  buildArgs: string
+}
+
+/**
+ * Map package-manager execution data into terminal-template fields.
+ * @param manager - selected package-manager strategy.
+ * @returns executable name and operation arguments.
+ */
+export function packageManagerTemplateModel(manager: PackageManager): PackageManagerTemplateModel {
+  return {
+    packageManager: manager.name,
+    installArgs: manager.installCommand().join(' '),
+    buildArgs: manager.buildCommand().join(' '),
+  }
+}
+
+/** Compiled create-sdk terminal templates. */
+export const CREATE_TEMPLATES = {
+  usage: TextTemplate.fromFile<Record<string, never>>(new URL('./assets/usage.txt.tpl', import.meta.url)),
+  created: TextTemplate.fromFile<CreatedTemplateModel>(new URL('./assets/created.txt.tpl', import.meta.url)),
+  nextSteps: TextTemplate.fromFile<NextStepsTemplateModel>(new URL('./assets/next-steps.txt.tpl', import.meta.url)),
+  setupFailure: TextTemplate.fromFile<SetupFailureTemplateModel>(
+    new URL('./assets/setup-failure.txt.tpl', import.meta.url),
+  ),
+  installQuestion: TextTemplate.fromFile<PackageManagerTemplateModel>(
+    new URL('./assets/install-question.txt.tpl', import.meta.url),
+  ),
+} as const