ci: add Flutter analyze + test + build APK + owner auto-merge

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+
+  # Note: Dependabot supports `pub` as of 2024 for Flutter.
+  - package-ecosystem: "pub"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  flutter:
+    name: flutter analyze + test + build apk
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Setup Java 17 (Android build)
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Setup Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+          cache: true
+
+      - run: flutter --version
+      - run: flutter pub get
+      - name: flutter analyze (advisory)
+        run: |
+          flutter analyze --no-fatal-infos --no-fatal-warnings || echo "::warning::flutter analyze warnings (advisory)"
+      - run: flutter test
+      - name: Build APK (debug, no signing)
+        run: flutter build apk --debug
+
+      - name: Upload APK artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: solux-debug-apk
+          path: build/app/outputs/flutter-apk/app-debug.apk
+          retention-days: 7

.github/workflows/owner-auto-merge.yml

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+name: Owner auto-merge
+
+on:
+  pull_request_target:
+    types: [opened, reopened, synchronize, ready_for_review]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  enable-auto-merge:
+    runs-on: ubuntu-22.04
+    if: >
+      github.event.pull_request.user.login == 'satyakwok' &&
+      github.event.pull_request.draft == false
+    steps:
+      - name: Enable auto-merge (squash) for owner PR
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_URL: ${{ github.event.pull_request.html_url }}
+        run: |
+          set -e
+          gh pr merge --auto --squash "$PR_URL" || {
+            echo "::warning::auto-merge enable returned non-zero — PR may already be merged, conflicted, or have auto-merge already enabled."
+            exit 0
+          }