Move shared infrastructure to a separate Infrastructure repo

Postgres, Zitadel, SeaweedFS, RabbitMQ and Jaeger no longer run as part
of this stack. They're shared services (used by Musify, Ping and
docker-manager) that now live in a separate Infrastructure repository
and must already be running.

deploy/compose.yml keeps only what's specific to Musify: its own
database connection, its own OIDC app and storage bucket (created
against the shared Zitadel/SeaweedFS via zitadel-init/seaweedfs-init),
and the application containers. A new wait-for-postgres one-shot
replaces the in-file Postgres health check, which no longer works now
that Postgres lives in a different compose project.

compose.prod.yml joins Infrastructure's infra-net network instead of
running its own copies. Docs and READMEs updated to match.

deploy/compose.dev.yml

@@ -1,67 +1,36 @@
 name: musify-dev
 
-# Development overlay: publishes the infrastructure ports to the host so the
-# .NET apps and the web player can run from the IDE, and adds pgAdmin.
+# Development overlay: publishes Musify's own ports to the host so the .NET
+# apps and the web player can run from the IDE.
 #
 #   docker compose -f deploy/compose.yml -f deploy/compose.dev.yml up -d
 #   docker compose -f deploy/compose.yml -f deploy/compose.dev.yml --profile apps up -d --build
 #
-# `host.docker.internal` (see ZITADEL_EXTERNAL_DOMAIN / *_PUBLIC_URL in .env)
-# resolves to the same address from the browser, from apps on the host and from
-# inside the containers, so the OIDC issuer and the presigned S3 URLs are valid
-# in both modes. `extra_hosts` gives Linux containers that same name.
+# Postgres/Zitadel/SeaweedFS/RabbitMQ/Jaeger ports come from Infrastructure's
+# own compose.dev.yml, not from here. See ../../../Infrastructure/README.md.
+# `host.docker.internal` resolves to the same address from the browser, from
+# apps on the host and from inside these containers, which is what makes the
+# OIDC issuer and the presigned S3 URLs valid in both run modes. `extra_hosts`
+# gives Linux containers that same name.
 
 x-host-alias: &host-alias
-  - "${ZITADEL_EXTERNAL_DOMAIN}:host-gateway"
+  - "host.docker.internal:host-gateway"
 
 services:
-  postgres:
-    ports:
-      - "${POSTGRES_HOST_PORT}:5432"
+  wait-for-postgres:
+    extra_hosts: *host-alias
 
-  zitadel:
-    ports:
-      - "${ZITADEL_EXTERNAL_PORT}:8080"
-
-  rabbitmq:
-    ports:
-      - "5672:5672"     # AMQP -> MassTransit
-      - "15672:15672"   # management UI
-
-  seaweedfs:
-    ports:
-      - "9333:9333"   # master / admin UI
-      - "8888:8888"   # filer      -> StreamingGateway
-      - "8333:8333"   # S3 API     -> API, Worker and presigned uploads
-
-  jaeger:
-    ports:
-      - "16686:16686"   # UI
-      - "4317:4317"     # OTLP gRPC
-      - "4318:4318"     # OTLP HTTP
+  seaweedfs-init:
+    extra_hosts: *host-alias
 
   # zitadel-init (compose.yml) edits whichever env file is mounted here.
   zitadel-init:
+    extra_hosts: *host-alias
     volumes:
       - ./.env:/workspace/.env
 
-  # Optional Postgres UI: docker compose ... --profile tools up -d
-  pgadmin:
-    profiles: [tools]
-    image: dpage/pgadmin4:latest
-    container_name: musify-pgadmin
-    environment:
-      PGADMIN_DEFAULT_EMAIL: ${PGADMIN_DEFAULT_EMAIL}
-      PGADMIN_DEFAULT_PASSWORD: ${PGADMIN_DEFAULT_PASSWORD}
-      PGADMIN_CONFIG_SERVER_MODE: "False"
-    depends_on:
-      postgres:
-        condition: service_healthy
-    ports:
-      - "${PGADMIN_HOST_PORT}:80"
-    volumes:
-      - pgadmin_data:/var/lib/pgadmin
-    restart: unless-stopped
+  migrate:
+    extra_hosts: *host-alias
 
   api:
     ports:
@@ -80,6 +49,3 @@ services:
     ports:
       - "3000:3000"
     extra_hosts: *host-alias
-
-volumes:
-  pgadmin_data: