v3: added opengraph support to the app, wrote README instructions incl. a Docker image

Dockerfile

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+# ── Stage 1: build Vite frontend ─────────────────────────────────────────────
+FROM denoland/deno:2.7.5 AS builder
+
+WORKDIR /app
+
+COPY deno.json deno.lock package.json ./
+COPY tsconfig*.json vite.config.ts ./
+RUN deno install
+
+COPY index.html ./
+COPY public/ ./public/
+COPY src/ ./src/
+
+# In same-origin deployments (API serves the frontend), no build args are needed
+# — the frontend uses relative URLs at runtime. Only set VITE_API_HOSTNAME if
+# the API lives on a different host than the frontend (e.g. a separate API server).
+ARG VITE_API_PROTOCOL
+ARG VITE_API_HOSTNAME
+ARG VITE_API_PORT
+ENV VITE_API_PROTOCOL=$VITE_API_PROTOCOL \
+    VITE_API_HOSTNAME=$VITE_API_HOSTNAME \
+    VITE_API_PORT=$VITE_API_PORT
+
+RUN deno task build
+
+# ── Stage 2: runtime ──────────────────────────────────────────────────────────
+FROM denoland/deno:2.7.5
+
+WORKDIR /app
+
+COPY deno.json deno.lock ./
+RUN deno install
+
+COPY api/ ./api/
+COPY --from=builder /app/dist/ ./dist/
+COPY public/ ./public/
+
+# Persistent data: database and user uploads must be mounted as volumes.
+VOLUME ["/app/api/sql", "/app/api/uploads"]
+
+EXPOSE 8000
+
+CMD ["sh", "-c", "deno run -A api/sql/init.ts && exec deno run -A api/main.ts"]