refactor: complete configuration cleanup and consistency fixes

- Create docker-compose.dev.yml with Mailhog for development email testing
- Standardize all configurations to use PORT=3001 for backend
- Fix database service naming (postgres → db) across all files
- Add missing BACKEND_URL environment variable to all configs
- Update .env examples to match actual Docker setup requirements
- Remove orphaned postgres-init directory (Umami handles its own DB)
- Update README roadmap: mark gallery feedback as implemented, add multi-admin support
- Update deployment guide with development setup instructions
- Fix frontend Dockerfile.dev for proper hot-reload development
- Remove unused files (wedding-photos.db, frontend/README.md)

This ensures all configuration files are consistent and aligned with the deployment guide.

frontend/Dockerfile.dev

@@ -1,45 +1,19 @@
-# Build stage
-FROM node:18-alpine AS builder
+# Dockerfile.dev - Development configuration for frontend
+FROM node:18-alpine
 
 WORKDIR /app
 
-# Accept build arguments
-ARG VITE_API_URL
-ARG VITE_UMAMI_URL
-ARG VITE_UMAMI_WEBSITE_ID
-
-# Set environment variables for build
-ENV VITE_API_URL=$VITE_API_URL
-ENV VITE_UMAMI_URL=$VITE_UMAMI_URL
-ENV VITE_UMAMI_WEBSITE_ID=$VITE_UMAMI_WEBSITE_ID
-
 # Copy package files
 COPY package*.json ./
 
 # Install dependencies
 RUN npm ci --legacy-peer-deps
 
-# Copy source files
+# Copy source code
 COPY . .
 
-# Build the application
-RUN npm run build
+# Expose the development server port
+EXPOSE 3005
 
-# Production stage
-FROM nginx:alpine
-
-# Copy custom nginx config
-COPY nginx.dev.conf /etc/nginx/conf.d/default.conf
-
-# Copy built application from builder stage
-COPY --from=builder /app/dist /usr/share/nginx/html
-
-# Health check
-HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
-    CMD curl -f http://localhost/health || exit 1
-
-# Expose port
-EXPOSE 80
-
-# Start nginx
-CMD ["nginx", "-g", "daemon off;"]
+# Start development server
+CMD ["npm", "run", "dev", "--", "--host", "0.0.0.0", "--port", "3005"]