Initial OSS scaffold from Songs2VID (pre-strip)

docker-compose.dev.yml

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+# Local infra only (Postgres + Redis). Use root docker-compose.yml for full stack.
+# Host ports 5433/6380 avoid clashes with other local stacks on 5432/6379.
+services:
+  postgres:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: s2yt
+      POSTGRES_PASSWORD: s2yt
+      POSTGRES_DB: s2yt
+    ports:
+      - "127.0.0.1:5433:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U s2yt -d s2yt"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  redis:
+    image: redis:7-alpine
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:6380:6379"
+    command: ["redis-server", "--appendonly", "yes"]
+    volumes:
+      - redis_data:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 3s
+      retries: 10
+
+volumes:
+  postgres_data:
+  redis_data: