Dodaj wsparcie Docker i dokumentację Claude Code

- Dodano Dockerfile z multi-stage build (artifacts + dev environment)
- Dodano .dockerignore dla optymalizacji budowania
- Dodano CLAUDE.md z dokumentacją architektury i workflow dla Claude Code

.dockerignore

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+.log
+node_modules
+sidebar.js
+web-ext-artifacts/
+lib/*
+yarn-error.log
+rentgen.zip
+
+# Generated PNG icons (build artifacts)
+assets/icons/*.png
+assets/icon-addon-*.png
+
+# Exception: do not ignore the `browser-api` directory inside `lib`
+!/lib/browser-api/
+
+Dockerfile

Dockerfile

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+# Rentgen Browser Extension - Docker Build
+#
+# Usage:
+#   Build and extract artifacts directly:
+#     docker buildx build . --output artifacts
+#
+#   Or traditional build (creates full development environment):
+#     docker build -t rentgen .
+#     docker run --rm rentgen ls -lh /app/web-ext-artifacts/
+#
+#   Run commands in the container:
+#     docker run --rm rentgen npm run build:chrome
+#     docker run --rm rentgen npm run typecheck
+
+# Build stage
+FROM node:lts AS builder
+
+WORKDIR /app
+
+# Copy package files for dependency installation (better layer caching)
+COPY package.json package-lock.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy source code (respecting .dockerignore)
+COPY . .
+
+# Build the extension for Firefox (default)
+RUN npm run build
+
+# Create the package
+RUN npm run create-package
+
+# Artifacts stage - only contains the built artifacts (for --output)
+FROM scratch AS artifacts
+
+# Copy only the built extension zip file to root
+COPY --from=builder /app/web-ext-artifacts/*.zip /
+
+# Default stage - full development environment
+FROM builder
+
+# Default command shows the built artifact
+CMD ["ls", "-lh", "/app/web-ext-artifacts/"]