Consolidate to single server with unified package.json

- Merge client and server dependencies into root package.json
- Remove separate client/package.json and server/package.json
- Update server/index.js to serve built client static files
- Simplify Dockerfile to single build + production stage
- Update dev scripts for unified development workflow
- SPA routing serves index.html for non-API routes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -1,15 +1,21 @@
-# Stage 1: Build client
-FROM node:20-alpine AS client-builder
+# Build stage
+FROM node:20-alpine AS builder
 
-WORKDIR /app/client
+WORKDIR /app
 
-COPY client/package*.json ./
+# Copy package files
+COPY package*.json ./
+
+# Install all dependencies (including client devDependencies for build)
 RUN npm install
 
-COPY client/ ./
+# Copy client source for build
+COPY client/ ./client/
+
+# Build the client
 RUN npm run build
 
-# Stage 2: Production server
+# Production stage
 FROM node:20-alpine
 
 # Install system dependencies for node-canvas and sharp
@@ -26,15 +32,15 @@ RUN apk add --no-cache \
 
 WORKDIR /app
 
-# Copy server package files and install
-COPY server/package*.json ./server/
-RUN cd server && npm install --production
+# Copy package files and install production dependencies only
+COPY package*.json ./
+RUN npm install --production
 
 # Copy server source
 COPY server/ ./server/
 
 # Copy built client from builder
-COPY --from=client-builder /app/client/dist ./server/dist
+COPY --from=builder /app/client/dist ./server/dist
 
 # Create data directories
 RUN mkdir -p /app/server/uploads /app/server/exports