Initial commit: 3D Viewer application

Features:
- Vue 3 frontend with Three.js/Online3DViewer
- Node.js API with PostgreSQL and Redis
- Python worker for model conversion
- Docker Compose for deployment
- ViewCube navigation with drag rotation and 90° snap
- Cross-section, exploded view, and render settings
- Parts tree with visibility controls

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

api/Dockerfile

@@ -0,0 +1,56 @@
+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Install pnpm
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
+# Copy package files
+COPY package.json pnpm-lock.yaml* ./
+
+# Install dependencies
+RUN pnpm install
+
+# Copy source code
+COPY . .
+
+# Build TypeScript
+RUN pnpm build
+
+# Production stage
+FROM node:20-alpine AS runner
+
+WORKDIR /app
+
+# Install pnpm
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
+# Create non-root user
+RUN addgroup --system --gid 1001 nodejs && \
+    adduser --system --uid 1001 expressjs
+
+# Copy package files
+COPY package.json pnpm-lock.yaml* ./
+
+# Install production dependencies only
+RUN pnpm install --prod
+
+# Copy built application
+COPY --from=builder /app/dist ./dist
+
+# Set ownership
+RUN chown -R expressjs:nodejs /app
+
+# Switch to non-root user
+USER expressjs
+
+# Expose port
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+  CMD wget -q --spider http://localhost:3000/api/health || exit 1
+
+# Start application
+CMD ["node", "dist/index.js"]