Initial commit: Multi-account IMAP sync with OAuth2 support

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG] "
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Which account (source/destination)?
+2. Configuration used (redact passwords!)
+3. Command run
+
+**Expected behavior**
+What you expected to happen.
+
+**Logs**
+```
+Relevant log output from logs/accountN.log or container logs
+```
+
+**Environment:**
+ - Docker version:
+ - Host OS:
+ - Source email provider:
+ - Destination IMAP server:
+ - Number of accounts:
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[FEATURE] "
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/workflows/docker.yml

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+name: Build & Push to Docker Hub
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+    branches: [main]
+
+env:
+  REGISTRY: docker.io
+  IMAGE_NAME: ${{ vars.DOCKERHUB_USERNAME }}/email-sync-oauth2
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Docker Hub
+        if: github.event_name != "pull_request"
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: ${{ github.event_name != "pull_request" }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Run healthcheck test
+        if: github.event_name == 'pull_request'
+        run: |
+          set -euo pipefail
+          trap 'docker compose down -v' EXIT
+          docker compose config --quiet
+          docker compose up -d
+          for _ in $(seq 1 18); do
+            status="$(docker inspect --format='{{.State.Health.Status}}' email-sync-oauth2)"
+            if [ "$status" = "healthy" ]; then
+              docker compose exec -T imapsync bash -n /sync.sh
+              exit 0
+            fi
+            sleep 10
+          done
+          docker compose logs
+          echo "Container did not become healthy" >&2
+          exit 1