feat: convert to argument.es — Spanish, vote buttons, Docker

- Translate all ~430 prompts to Spanish with cultural adaptations
- Translate all UI strings (frontend, admin, history, broadcast)
- Translate AI system prompts; models now respond in Spanish
- Replace Twitch/Fossabot viewer voting with in-site vote buttons
- Add POST /api/vote endpoint (IP-based, supports vote switching)
- Vote buttons appear during voting phase with active state highlight
- Rename project to argument.es throughout (package.json, cookie, DB)
- Add docker-compose.yml with SQLite volume mount
- Add .env.sample documenting all required and optional vars

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,30 @@
+services:
+  argumentes:
+    build: .
+    container_name: argument.es
+    restart: unless-stopped
+    ports:
+      - "${PORT:-5109}:${PORT:-5109}"
+    environment:
+      - NODE_ENV=production
+      - PORT=${PORT:-5109}
+      - OPENROUTER_API_KEY=${OPENROUTER_API_KEY}
+      - ADMIN_SECRET=${ADMIN_SECRET}
+      - DATABASE_PATH=/data/argumentes.sqlite
+      - VIEWER_VOTE_BROADCAST_DEBOUNCE_MS=${VIEWER_VOTE_BROADCAST_DEBOUNCE_MS:-250}
+      - HISTORY_LIMIT_PER_MIN=${HISTORY_LIMIT_PER_MIN:-120}
+      - ADMIN_LIMIT_PER_MIN=${ADMIN_LIMIT_PER_MIN:-10}
+      - MAX_WS_GLOBAL=${MAX_WS_GLOBAL:-100000}
+      - MAX_WS_PER_IP=${MAX_WS_PER_IP:-8}
+      - MAX_WS_NEW_PER_SEC=${MAX_WS_NEW_PER_SEC:-50}
+    volumes:
+      - argumentes_data:/data
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:${PORT:-5109}/healthz"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
+
+volumes:
+  argumentes_data: