docs: update deployment env and runtime docs for convex qwen minio

Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /app
 
 ENV NODE_ENV=production
 ENV PORT=3000
-ENV STATE_FILE_PATH=/data/state.json
+ENV CONVEX_DEPLOYMENT_URL=
 
 COPY package.json bun.lock ./
 RUN bun install --frozen-lockfile
@@ -15,7 +15,6 @@ COPY spec.md ./spec.md
 RUN bun run build:css
 
 EXPOSE 3000
-VOLUME ["/data"]
 
 HEALTHCHECK --interval=30s --timeout=5s --retries=3 CMD bun -e "fetch('http://127.0.0.1:'+process.env.PORT+'/health').then((r)=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"