feat: add StroyBot app shell with URL routing

One web part replaces the separate stroy-bot-* web parts. The section and
its parameters live in the page query string (?page=objects&projectId=5),
so links can be copied, opened in a new tab and the browser Back button works.

- shared config: site/Dataverse/API addresses, list and table names
- HTTP layer behind IHttpClient so repositories can be unit-tested
- ui-kit AppLayout + Sidebar, placeholder for sections not ported yet
- migration checklist with every feature of the old web parts
- design tokens mirrored from ui-kit instead of 8 copies

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/webparts/stroyBot/services/http/spfxClients.ts

@@ -0,0 +1,43 @@
+import { WebPartContext } from '@microsoft/sp-webpart-base';
+import { SPHttpClient, AadHttpClient } from '@microsoft/sp-http';
+import { IHttpClient, IHttpRequest, IHttpResponse } from './IHttpClient';
+
+// Адаптеры SPFx-клиентов к IHttpClient. Вся работа с авторизацией — здесь,
+// остальной код о SPFx не знает.
+
+export function createSharePointClient(context: WebPartContext): IHttpClient {
+  return {
+    fetch: (url: string, request: IHttpRequest = {}): Promise<IHttpResponse> =>
+      context.spHttpClient.fetch(url, SPHttpClient.configurations.v1, {
+        method: request.method ?? 'GET',
+        headers: request.headers,
+        body: request.body
+      })
+  };
+}
+
+/**
+ * Клиент к ресурсу под AAD (Dataverse или корпоративный API).
+ * AadHttpClient создаётся лениво и один раз — получение клиента запрашивает токен.
+ */
+export function createAadClient(context: WebPartContext, resource: string): IHttpClient {
+  let clientPromise: Promise<AadHttpClient> | undefined;
+
+  const getClient = (): Promise<AadHttpClient> => {
+    if (!clientPromise) {
+      clientPromise = context.aadHttpClientFactory.getClient(resource);
+    }
+    return clientPromise;
+  };
+
+  return {
+    fetch: async (url: string, request: IHttpRequest = {}): Promise<IHttpResponse> => {
+      const client = await getClient();
+      return client.fetch(url, AadHttpClient.configurations.v1, {
+        method: request.method ?? 'GET',
+        headers: request.headers,
+        body: request.body
+      });
+    }
+  };
+}