Add Portainer deployment files

PORTAINER_DEPLOYMENT.md

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+# Portainer deployment notes
+
+Generated from the current Kubernetes deployment in namespace `discord-bots`. Secret values are in the local `portainer-*.env` files.
+
+## Kubernetes source
+
+- Deployment: `prepbot`
+- Replicas: `1`
+- Rolling update: maxSurge `1`, maxUnavailable `1`
+- minReadySeconds: `120`
+- Labels/selectors: `app=prepbot`
+- Image pull secrets: `none required for Portainer stack`
+
+## Containers
+
+- `prepbot`: image `gitea.wayfinderak.com/wayfinderak/prepbot:latest`; env: DISCORD_TOKEN, LINK_CHANNEL, CHAT_CHANNEL; ports: none; requests: {'cpu': '1', 'memory': '512Mi'}; limits: {'cpu': '2', 'memory': '1Gi'}
+
+## Portainer files
+
+- `portainer-stack.yml` - Docker Compose stack to paste/use in Portainer.
+- `portainer-app.env` - bot runtime secrets/env.

portainer-stack.yml

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+services:
+  prepbot:
+    image: gitea.wayfinderak.com/wayfinderak/prepbot:latest
+    container_name: prepbot
+    restart: unless-stopped
+    env_file:
+      - ./portainer-app.env
+    mem_limit: 1g
+    cpus: "2.0"