deploy(prod): swap NetBird-Traefik labels for off-stack proxy + internal Caddy

The stack no longer talks to any specific external proxy. Removed traefik.*
labels and the shared `traefik` external network from kong + app, and dropped
TRAEFIK_NETWORK / TRAEFIK_ENTRYPOINT / TRAEFIK_CERTRESOLVER from the .env
template and the deploy-script bootstrap.

Internal edge is a `caddy:2-alpine` container on the `colectivo` network,
publishing host port 3000. `infra/Caddyfile.erosi` does the path split:
/rest|/auth|/realtime|/storage|/graphql|/pg -> kong:8000, everything else
-> app:3000. Global block sets `auto_https off` + `admin off` so :3000 is
the only listener.

Whatever proxy fronts the host (NetBird's Traefik, nginx, anything) just
terminates TLS for erosi.limonia.net and forwards plain HTTP to
ambrosio:3000. Off-stack and out of this repo.

Docs (CLAUDE.md + docs/deployment.md) updated to describe the two-layer
edge. Includes the gotcha that bind-mounted file edits (Caddyfile) need
`docker compose restart caddy` since `up -d` won't recreate the container
on file-only changes.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

infra/docker-compose.erosi.yml

@@ -1,13 +1,13 @@
 name: colectivo-erosi
 
 # Production stack for ambrosio.
-# Domain: erosi.limonia.net (app + Supabase API, single-domain).
 # Keycloak: external — URL set via PUBLIC_KEYCLOAK_URL in .env.
 #
-# TLS + reverse proxy is handled by Traefik (deployed by NetBird's self-hosted
-# installer on ambrosio). `kong` and `app` attach to Traefik's Docker network
-# (name in ${TRAEFIK_NETWORK}) and expose themselves via traefik.* labels.
-# No container binds a host port.
+# Reverse proxy + TLS are owned externally and not described here. The stack
+# exposes nothing publicly — `kong` (8000) and `app` (3000) listen on the
+# internal `colectivo` Docker network only. Whatever proxy fronts the host is
+# responsible for reaching them (e.g. via the Docker network or by mapping
+# host ports).
 #
 # Bring up:    docker compose -f infra/docker-compose.erosi.yml --env-file .env up -d --build
 # Logs:        docker compose -f infra/docker-compose.erosi.yml logs -f
@@ -162,15 +162,7 @@ services:
     volumes:
       - ./kong.yml:/home/kong/temp.yml:ro
       - ./kong-start.sh:/home/kong/kong-start.sh:ro
-    networks: [colectivo, traefik]
-    labels:
-      - "traefik.enable=true"
-      - "traefik.docker.network=${TRAEFIK_NETWORK}"
-      - "traefik.http.routers.erosi-kong.rule=Host(`erosi.limonia.net`) && (PathPrefix(`/rest/v1`) || PathPrefix(`/auth/v1`) || PathPrefix(`/realtime/v1`) || PathPrefix(`/storage/v1`) || PathPrefix(`/graphql/v1`) || PathPrefix(`/pg`))"
-      - "traefik.http.routers.erosi-kong.entrypoints=${TRAEFIK_ENTRYPOINT}"
-      - "traefik.http.routers.erosi-kong.tls.certresolver=${TRAEFIK_CERTRESOLVER}"
-      - "traefik.http.routers.erosi-kong.priority=100"
-      - "traefik.http.services.erosi-kong.loadbalancer.server.port=8000"
+    networks: [colectivo]
 
   # ── App (SvelteKit Node server) — built on the host from the repo ──────────
   # Build args bake the PUBLIC_* values into the client bundle (SvelteKit reqs).
@@ -195,22 +187,24 @@ services:
       PUBLIC_KEYCLOAK_CLIENT_ID: ${PUBLIC_KEYCLOAK_CLIENT_ID}
       PUBLIC_APP_URL: ${PUBLIC_APP_URL}
       NODE_ENV: production
-    networks: [colectivo, traefik]
-    labels:
-      - "traefik.enable=true"
-      - "traefik.docker.network=${TRAEFIK_NETWORK}"
-      - "traefik.http.routers.erosi-app.rule=Host(`erosi.limonia.net`)"
-      - "traefik.http.routers.erosi-app.entrypoints=${TRAEFIK_ENTRYPOINT}"
-      - "traefik.http.routers.erosi-app.tls.certresolver=${TRAEFIK_CERTRESOLVER}"
-      - "traefik.http.routers.erosi-app.priority=1"
-      - "traefik.http.services.erosi-app.loadbalancer.server.port=3000"
+    networks: [colectivo]
+
+  # ── Internal edge: path-split kong vs app on a single port ────────────────
+  # Plain HTTP. TLS + outermost routing live on whatever external proxy
+  # fronts the host; that proxy only needs to know about port 3000.
+  caddy:
+    image: caddy:2-alpine
+    restart: always
+    depends_on: [kong, app]
+    volumes:
+      - ./Caddyfile.erosi:/etc/caddy/Caddyfile:ro
+    ports:
+      - "3000:3000"
+    networks: [colectivo]
 
 networks:
   colectivo:
     driver: bridge
-  traefik:
-    name: ${TRAEFIK_NETWORK}
-    external: true
 
 volumes:
   db-data: