chore(docker): improve base image and organize docker files

- Add wget, ripgrep, python3, and GitHub CLI (gh) to base image
- Add OPENCODE_ALLOW_ALL_MODELS=true to production ENV
- Move compose files, onboard-smoke Dockerfile to docker/
- Move entrypoint script to scripts/docker-entrypoint.sh
- Add Podman Quadlet unit files (pod, app, db containers)
- Add docker/README.md with build, compose, and quadlet docs
- Add scripts/docker-build-test.sh for local build validation
- Update all doc references for new file locations
- Keep main Dockerfile at project root (no .dockerignore changes needed)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

docker/quadlet/paperclip-db.container

@@ -0,0 +1,20 @@
+[Unit]
+Description=PostgreSQL for Paperclip
+
+[Container]
+Image=docker.io/library/postgres:17-alpine
+ContainerName=paperclip-db
+Pod=paperclip.pod
+Volume=paperclip-pgdata:/var/lib/postgresql/data
+EnvironmentFile=%h/.config/containers/systemd/paperclip.env
+HealthCmd=pg_isready -U $POSTGRES_USER -d $POSTGRES_DB -h localhost || exit 1
+HealthInterval=15s
+HealthTimeout=5s
+HealthRetries=5
+
+[Service]
+Restart=on-failure
+TimeoutStartSec=60
+
+[Install]
+WantedBy=default.target

docker/quadlet/paperclip.container

@@ -0,0 +1,23 @@
+[Unit]
+Description=Paperclip AI Agent Orchestrator
+Requires=paperclip-db.service
+After=paperclip-db.service
+
+[Container]
+Image=paperclip-local
+ContainerName=paperclip
+Pod=paperclip.pod
+Volume=%h/.local/share/paperclip:/paperclip:Z
+Environment=HOST=0.0.0.0
+Environment=PAPERCLIP_HOME=/paperclip
+Environment=PAPERCLIP_DEPLOYMENT_MODE=authenticated
+Environment=PAPERCLIP_DEPLOYMENT_EXPOSURE=private
+Environment=PAPERCLIP_PUBLIC_URL=http://localhost:3100
+EnvironmentFile=%h/.config/containers/systemd/paperclip.env
+
+[Service]
+Restart=on-failure
+TimeoutStartSec=120
+
+[Install]
+WantedBy=default.target

docker/quadlet/paperclip.pod

@@ -0,0 +1,3 @@
+[Pod]
+PodName=paperclip
+PublishPort=3100:3100