Restore missing project configuration files

Restored all configuration and documentation files that were missing:
- devenv.nix and devenv.lock for development environment
- README.md, CLAUDE.md, DOCKER.md, WARP.md for documentation
- alembic.ini for database migrations
- requirements.txt for Python dependencies
- Dockerfile, docker-compose.yml, entrypoint.sh for containerization
- build.sh for build automation
- pytest.ini for test configuration

All database concurrency improvements and logging fixes remain intact.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docker-compose.yml

@@ -0,0 +1,29 @@
+services:
+  dosvault:
+    image: tty303/dosvault:latest
+    ports:
+      - "${DOSVAULT_PORT:-8080}:8080"
+      - "${DOSVAULT_WEBSOCKET_PORT:-8081}:8081"
+    volumes:
+      - dosvault_data:/app/data
+      - "${ROMS_PATH:-./roms}:/app/data/roms:ro"
+    environment:
+      # IGDB API Configuration
+      - IGDB_CLIENT_ID=${IGDB_CLIENT_ID}
+      - IGDB_SECRET_KEY=${IGDB_SECRET_KEY}
+      # Application Configuration  
+      - DOSFRONTEND_CONFIG_DIR=/app/data
+      - DOSVAULT_ADMIN_USERNAME=${DOSVAULT_ADMIN_USERNAME:-}
+      - DOSVAULT_ADMIN_EMAIL=${DOSVAULT_ADMIN_EMAIL:-}
+      - DOSVAULT_ADMIN_PASSWORD=${DOSVAULT_ADMIN_PASSWORD:-}
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
+volumes:
+  dosvault_data:
+    driver: local