feat: initial commit — OST to PST/MBOX converter with Docker support

Dockerfile

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+# ─────────────────────────────────────────────────────────────────────────────
+# OST to PST Converter
+# Base: Eclipse Temurin 21 JRE (Debian Bookworm slim) + Node.js 22 LTS
+# ─────────────────────────────────────────────────────────────────────────────
+FROM eclipse-temurin:21-jre-bookworm
+
+LABEL maintainer="OST2PST Converter"
+LABEL description="Converts Outlook OST files to PST or MBOX format via a web UI"
+
+# ── Install Node.js 22 via NodeSource ────────────────────────────────────────
+RUN apt-get update && apt-get install -y curl ca-certificates --no-install-recommends \
+    && curl -fsSL https://deb.nodesource.com/setup_22.x | bash - \
+    && apt-get install -y nodejs --no-install-recommends \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# ── App directory ─────────────────────────────────────────────────────────────
+WORKDIR /app
+
+# ── Install Node dependencies first (better layer caching) ────────────────────
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+# ── Copy application files ────────────────────────────────────────────────────
+COPY server.js Convert.java aspose-email-24.12-jdk16.jar ./
+COPY public/ ./public/
+
+# ── Create runtime directories ────────────────────────────────────────────────
+RUN mkdir -p uploads converted
+
+# ── Expose web UI port ────────────────────────────────────────────────────────
+EXPOSE 3000
+
+# ── Health check ──────────────────────────────────────────────────────────────
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD curl -f http://localhost:3000 || exit 1
+
+# ── Start server ──────────────────────────────────────────────────────────────
+CMD ["node", "server.js"]