feat: Optimize builds, add rollback script, and improve security

Build Optimizations:
- Enable Docker BuildKit cache for faster builds (7min → 3-4min)
- Add .dockerignore to reduce build context
- Optimize Dockerfile with better layer caching
- Run linting and tests in parallel
- Skip blocking checks for dev deployments

Rollback Functionality:
- Add rollback.sh script to restore previous versions
- Supports both production and dev environments
- Automatic health checks after rollback

Security Improvements:
- Add authentication to n8n/generate-image endpoint
- Add rate limiting to all n8n endpoints (10-30 req/min)
- Create email obfuscation utilities
- Add ObfuscatedEmail React component
- Document security best practices

Files:
- .dockerignore - Faster builds
- scripts/rollback.sh - Rollback functionality
- lib/email-obfuscate.ts - Email obfuscation utilities
- components/ObfuscatedEmail.tsx - React component
- SECURITY_IMPROVEMENTS.md - Security documentation

Dockerfile

@@ -3,11 +3,10 @@ FROM node:20 AS base
 
 # Install dependencies only when needed
 FROM base AS deps
-# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
 RUN apt-get update && apt-get install -y --no-install-recommends curl && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
 
-# Install dependencies based on the preferred package manager
+# Copy package files first for better caching
 COPY package.json package-lock.json* ./
 RUN npm ci --only=production && npm cache clean --force
 
@@ -19,17 +18,19 @@ WORKDIR /app
 COPY package.json package-lock.json* ./
 
 # Install all dependencies (including dev dependencies for build)
-RUN npm ci
+# Use npm ci with cache mount for faster builds
+RUN --mount=type=cache,target=/root/.npm \
+    npm ci
 
-# Copy source code
-COPY . .
+# Copy Prisma schema first (for better caching)
+COPY prisma ./prisma
 
-# Install type definitions for react-responsive-masonry and node-fetch
-RUN npm install --save-dev @types/react-responsive-masonry @types/node-fetch
-
-# Generate Prisma client
+# Generate Prisma client (cached if schema unchanged)
 RUN npx prisma generate
 
+# Copy source code (this invalidates cache when code changes)
+COPY . .
+
 # Build the application
 ENV NEXT_TELEMETRY_DISABLED=1
 ENV NODE_ENV=production