feat: automatic deploy system (poll+deploy docker stack on Unraid)

- deployer container polls git, builds api/worker/web, runs migrations+seed,
  starts ff-api/ff-worker/ff-web + nginx TLS reverse proxy against external
  Postgres (10.0.0.15)
- Dockerfile.web: drop missing packages/ui package, add NEXT_PUBLIC_API_URL arg
- add root .dockerignore (build context cleanup)

infrastructure/deploy/deployer.Dockerfile

@@ -0,0 +1,18 @@
+FROM alpine:3.21
+
+RUN apk add --no-cache \
+    docker-cli \
+    git \
+    bash \
+    openssl \
+    curl \
+    coreutils \
+    findutils \
+    ca-certificates \
+    tzdata
+
+COPY deploy.sh /usr/local/bin/deploy.sh
+COPY nginx.conf /etc/fleetforge/nginx.conf
+RUN chmod +x /usr/local/bin/deploy.sh
+
+ENTRYPOINT ["/usr/local/bin/deploy.sh"]