ci: move workflows to the repository root

GitHub only runs workflows from .github/workflows at the root, so the six
workflows inherited from the two projects have to live there rather than under
web/ and android/. Each one gets a path filter so web-only changes do not
trigger Android builds, a working directory for its subproject, and a prefixed
filename to keep the two sets apart.

Gradle now sits at android/android, the Firebase action reads its config from
web/ via entryPoint, and the Android checkout no longer needs submodules.

web/.github/workflows/deploy-github-pages.yml

@@ -1,42 +0,0 @@
-name: Deploy to GitHub Pages
-
-on:
-  push:
-    branches: [main]
-  workflow_dispatch:
-
-permissions:
-  contents: read
-  pages: write
-  id-token: write
-
-concurrency:
-  group: github-pages
-  cancel-in-progress: true
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v7
-      - uses: pnpm/action-setup@v6
-      - uses: actions/setup-node@v7
-        with:
-          node-version: '24'
-          cache: pnpm
-      - run: pnpm install --frozen-lockfile
-      - run: pnpm build:gh
-      - uses: actions/configure-pages@v6
-      - uses: actions/upload-pages-artifact@v5
-        with:
-          path: build
-
-  deploy:
-    needs: build
-    runs-on: ubuntu-latest
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    steps:
-      - id: deployment
-        uses: actions/deploy-pages@v5

web/.github/workflows/firebase-hosting-merge.yml

@@ -1,20 +0,0 @@
-# This file was auto-generated by the Firebase CLI
-# https://github.com/firebase/firebase-tools
-
-name: Deploy to Firebase Hosting on merge
-on:
-  push:
-    branches:
-      - main
-jobs:
-  build_and_deploy:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v7
-      - run: npm ci && npm run build
-      - uses: FirebaseExtended/action-hosting-deploy@v0
-        with:
-          repoToken: ${{ secrets.GITHUB_TOKEN }}
-          firebaseServiceAccount: ${{ secrets.FIREBASE_SERVICE_ACCOUNT_LOOTOO }}
-          channelId: live
-          projectId: lootoo

web/.github/workflows/firebase-hosting-pull-request.yml

@@ -1,21 +0,0 @@
-# This file was auto-generated by the Firebase CLI
-# https://github.com/firebase/firebase-tools
-
-name: Deploy to Firebase Hosting on PR
-on: pull_request
-permissions:
-  checks: write
-  contents: read
-  pull-requests: write
-jobs:
-  build_and_preview:
-    if: ${{ github.event.pull_request.head.repo.full_name == github.repository }}
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v7
-      - run: npm ci && npm run build
-      - uses: FirebaseExtended/action-hosting-deploy@v0
-        with:
-          repoToken: ${{ secrets.GITHUB_TOKEN }}
-          firebaseServiceAccount: ${{ secrets.FIREBASE_SERVICE_ACCOUNT_LOOTOO }}
-          projectId: lootoo

web/.github/workflows/verify-build.yml

@@ -1,28 +0,0 @@
-name: Verify build
-
-on:
-  pull_request:
-    branches: [main]
-  push:
-    branches: [main]
-
-permissions:
-  contents: read
-
-concurrency:
-  group: verify-build-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  verify:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v7
-      - uses: pnpm/action-setup@v6
-      - uses: actions/setup-node@v7
-        with:
-          node-version: '24'
-          cache: pnpm
-      - run: pnpm install --frozen-lockfile
-      - run: pnpm test
-      - run: pnpm build