Add Docker Compose deployment setup

Dockerfile

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+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY . .
+
+ARG GITEA_BASE_URL=""
+ARG GITEA_TOKEN=""
+ARG GITEA_USERNAME=""
+ARG SEAFILE_BASE_URL=""
+ARG SEAFILE_TOKEN=""
+ARG SYNC_OUTPUT_DIR="src/data/generated"
+ARG STRICT_SYNC="false"
+ARG SEAFILE_MIRROR_DOWNLOADS="false"
+ARG DOWNLOADS_OUTPUT_DIR="public/downloads"
+ARG GITEA_ACTIVITY_DAYS="70"
+ARG GITEA_ACTIVITY_PER_DAY_LIMIT="50"
+ARG GITEA_RECENT_ITEM_LIMIT="8"
+ARG GITEA_REQUEST_TIMEOUT_MS="15000"
+ARG GITEA_REQUEST_CONCURRENCY="5"
+ARG SEAFILE_REQUEST_TIMEOUT_MS="15000"
+
+ENV GITEA_BASE_URL="${GITEA_BASE_URL}" \
+    GITEA_TOKEN="${GITEA_TOKEN}" \
+    GITEA_USERNAME="${GITEA_USERNAME}" \
+    SEAFILE_BASE_URL="${SEAFILE_BASE_URL}" \
+    SEAFILE_TOKEN="${SEAFILE_TOKEN}" \
+    SYNC_OUTPUT_DIR="${SYNC_OUTPUT_DIR}" \
+    STRICT_SYNC="${STRICT_SYNC}" \
+    SEAFILE_MIRROR_DOWNLOADS="${SEAFILE_MIRROR_DOWNLOADS}" \
+    DOWNLOADS_OUTPUT_DIR="${DOWNLOADS_OUTPUT_DIR}" \
+    GITEA_ACTIVITY_DAYS="${GITEA_ACTIVITY_DAYS}" \
+    GITEA_ACTIVITY_PER_DAY_LIMIT="${GITEA_ACTIVITY_PER_DAY_LIMIT}" \
+    GITEA_RECENT_ITEM_LIMIT="${GITEA_RECENT_ITEM_LIMIT}" \
+    GITEA_REQUEST_TIMEOUT_MS="${GITEA_REQUEST_TIMEOUT_MS}" \
+    GITEA_REQUEST_CONCURRENCY="${GITEA_REQUEST_CONCURRENCY}" \
+    SEAFILE_REQUEST_TIMEOUT_MS="${SEAFILE_REQUEST_TIMEOUT_MS}"
+
+RUN npm run rebuild
+
+FROM nginx:1.27-alpine AS runtime
+
+COPY docker/nginx/default.conf /etc/nginx/conf.d/default.conf
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+EXPOSE 80
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget -q -O /dev/null http://127.0.0.1/ || exit 1