Initial commit: StackPilot Phase 1 (Core)

Self-hosted Docker Compose manager.
- Backend: FastAPI + docker-py + SQLite (JWT auth, file-first stacks,
  lifecycle, live status, WebSocket logs, docker-run converter, audit log)
- Frontend: React + Vite + Tailwind (login/setup, dashboard, stacks,
  stack detail, Monaco editor, dark/light theme)
- Deployment: docker-compose.yml, Dockerfiles, nginx reverse proxy

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,30 @@
+services:
+  backend:
+    build: ./backend
+    image: stackpilot/backend:latest
+    restart: unless-stopped
+    environment:
+      - SECRET_KEY=${SECRET_KEY}
+      - STACKS_DIR=/opt/stacks
+      - DATA_DIR=/data
+      - HOST_PROC_PATH=/host_proc
+      - CORS_ORIGINS=${CORS_ORIGINS:-http://localhost:5009}
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+      - ./data:/data
+      - ${STACKS_HOST_DIR:-./data/stacks}:/opt/stacks
+      - /proc:/host_proc:ro
+    expose:
+      - "5008"
+    # Uncomment to expose the API directly (normally proxied by the frontend):
+    # ports:
+    #   - "5008:5008"
+
+  frontend:
+    build: ./frontend
+    image: stackpilot/frontend:latest
+    restart: unless-stopped
+    depends_on:
+      - backend
+    ports:
+      - "5009:80"