chore: remove mobile/ from monorepo, suspend CI mobile job

* chore: update exchange submodule to pex.network release + add shared images

Exchange submodule advanced to include:
- sweeper.js: TRC-20 JWT Bearer auth, DOT transferAll, PEZ-AH pre-fund
- docker-compose.yml: pex.network defaults for VITE_API_BASE_URL and SMTP_FROM
- .github/workflows/build-deploy.yml: pex.network build arg for web service

Shared images added: keziyakurd, kiwi_perwerde, kurdistan_assembly, pezkuwi, satoshi_qazi_muh

* chore: remove mobile/ from monorepo, suspend CI mobile job

Mobile app moved to /home/mamostehp/pwap-mobile (local, suspended).
Will be re-integrated when mobile development resumes.

- Removed mobile/ directory entirely
- Removed Mobile App job from quality-gate.yml so CI no longer blocks

.github/workflows/quality-gate.yml

@@ -74,42 +74,6 @@ jobs:
           name: web-dist
           path: web/dist/
 
-  # ========================================
-  # MOBILE APP - LINT & TEST
-  # ========================================
-  mobile:
-    name: Mobile App
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '20'
-
-      - name: Cache npm dependencies
-        uses: actions/cache@v4
-        with:
-          path: mobile/node_modules
-          key: ${{ runner.os }}-mobile-${{ hashFiles('mobile/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-mobile-
-
-      - name: Install dependencies
-        working-directory: ./mobile
-        run: npm install --legacy-peer-deps
-
-      - name: Run Linter
-        working-directory: ./mobile
-        run: npm run lint
-
-      - name: Run Tests
-        working-directory: ./mobile
-        run: npm run test
-
   # ========================================
   # DEPLOY WEB APP TO VPS
   # ========================================