Migrate to Docker: containerize for docker-server deployment

- Add Dockerfile + cron.js (daily 4pm UTC loop replacing EC2 cron)
- Add infra/docker-compose.yml and deploy-stack.sh for Portainer
- Support DATA_DIR env var in bot.js for persistent history volume
- Support PROMPTS_JSON env var in cron.js (no SSH needed for config)

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

infra/docker-compose.yml

@@ -0,0 +1,40 @@
+services:
+
+  thejunipersky-tease:
+    image: ${REGISTRY}/xbot:latest
+    restart: unless-stopped
+    environment:
+      PROMPT_NAME: tease
+      PROMPTS_JSON: ${PROMPTS_JSON}
+      DATA_DIR: /data
+      ANTHROPIC: ${ANTHROPIC}
+      KERNEL: ${KERNEL}
+      THEJUNIPERSKY_USER: ${THEJUNIPERSKY_USER}
+      THEJUNIPERSKY_PW: ${THEJUNIPERSKY_PW}
+      THEJUNIPERSKY_EMAIL: ${THEJUNIPERSKY_EMAIL}
+      THEJUNIPERSKY_PHONE: ${THEJUNIPERSKY_PHONE}
+    volumes:
+      - xbot-data:/data
+
+  thejunipersky-personality:
+    image: ${REGISTRY}/xbot:latest
+    restart: unless-stopped
+    environment:
+      PROMPT_NAME: personality
+      PROMPTS_JSON: ${PROMPTS_JSON}
+      DATA_DIR: /data
+      ANTHROPIC: ${ANTHROPIC}
+      KERNEL: ${KERNEL}
+      THEJUNIPERSKY_USER: ${THEJUNIPERSKY_USER}
+      THEJUNIPERSKY_PW: ${THEJUNIPERSKY_PW}
+      THEJUNIPERSKY_EMAIL: ${THEJUNIPERSKY_EMAIL}
+      THEJUNIPERSKY_PHONE: ${THEJUNIPERSKY_PHONE}
+    volumes:
+      - xbot-data:/data
+
+volumes:
+  xbot-data:
+
+networks:
+  xbot-net:
+    name: xbot-net