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/StroyBotWebPart.manifest.json

@@ -0,0 +1,25 @@
+{
+  "$schema": "https://developer.microsoft.com/json-schemas/spfx/client-side-web-part-manifest.schema.json",
+  "id": "619a5eba-d596-47e5-a95a-9b9682ed7ec3",
+  "alias": "StroyBotWebPart",
+  "componentType": "WebPart",
+
+  // The "*" signifies that the version should be taken from the package.json
+  "version": "*",
+  "manifestVersion": 2,
+
+  "requiresCustomScript": false,
+  "supportedHosts": ["SharePointWebPart", "SharePointFullPage"],
+  "supportsThemeVariants": true,
+
+  "preconfiguredEntries": [
+    {
+      "groupId": "5c03119e-3074-46fd-976b-c60198311f70", // Advanced
+      "group": { "default": "Advanced" },
+      "title": { "default": "StroyBot" },
+      "description": { "default": "StroyBot: проекты, объекты, работы и отчёты" },
+      "officeFabricIconFontName": "ConstructionCone",
+      "properties": {}
+    }
+  ]
+}