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>

config/config.json

@@ -2,17 +2,15 @@
   "$schema": "https://developer.microsoft.com/json-schemas/spfx-build/config.2.0.schema.json",
   "version": "2.0",
   "bundles": {
-    "stroy-bot-monorepo-web-part": {
+    "stroy-bot-web-part": {
       "components": [
         {
-          "entrypoint": "./lib/webparts/stroyBotMonorepo/StroyBotMonorepoWebPart.js",
-          "manifest": "./src/webparts/stroyBotMonorepo/StroyBotMonorepoWebPart.manifest.json"
+          "entrypoint": "./lib/webparts/stroyBot/StroyBotWebPart.js",
+          "manifest": "./src/webparts/stroyBot/StroyBotWebPart.manifest.json"
         }
       ]
     }
   },
   "externals": {},
-  "localizedResources": {
-    "StroyBotMonorepoWebPartStrings": "lib/webparts/stroyBotMonorepo/loc/{locale}.js"
-  }
+  "localizedResources": {}
 }