feat: point third-party mode at upstream Yu9191 modules

- subscription URLs now resolve directly to upstream modules (gh-proxy
  mirror / raw), dropping project-owned module and script copies
- remove Resources/ThirdPartyProxyModules and ThirdParty/WlocScripts,
  their pbxproj references, and the contract-test module checks
- third-party save sends lon/lat/acc matching the upstream settings
  script; motion-state simulation is unavailable (upstream lacks it)
- surface the iOS 27 beta 6 gs-loc MITM limitation in the app setup and
  README (zh/en)

ThirdParty/WlocScripts/package.json

@@ -1,16 +0,0 @@
-{
-  "name": "@location-spoofer/wloc-scripts",
-  "version": "1.0.0",
-  "private": true,
-  "type": "module",
-  "scripts": {
-    "build": "node build.mjs",
-    "test": "node --test"
-  },
-  "dependencies": {
-    "pako": "2.1.0"
-  },
-  "devDependencies": {
-    "esbuild": "0.25.8"
-  }
-}