🎓 Initial commit: Math2 Platform - Plataforma de Álgebra Lineal PRO

✨ Características:
- 45 ejercicios universitarios (Basic → Advanced)
- Renderizado LaTeX profesional
- IA generativa (Z.ai/DashScope)
- Docker 9 servicios
- Tests 123/123 pasando
- Seguridad enterprise (JWT, XSS, Rate limiting)

🐳 Infraestructura:
- Next.js 14 + Node.js 20
- PostgreSQL 15 + Redis 7
- Docker Compose completo
- Nginx + SSL ready

📚 Documentación:
- 5 informes técnicos completos
- README profesional
- Scripts de deployment automatizados

Estado: Producción lista ✅

docker/Dockerfile.worker

@@ -0,0 +1,194 @@
+# ==================================================
+# MULTI-STAGE DOCKERFILE - WORKERS (PDF, Exercise, Notification)
+# Node.js 20 LTS + TypeScript + Real Health Checks
+# ==================================================
+
+# --------------------------------------------------
+# STAGE 1: Base Dependencies
+# --------------------------------------------------
+FROM node:20-alpine AS base
+WORKDIR /app
+
+# Install build dependencies
+RUN apk add --no-cache \
+    python3 \
+    make \
+    g++ \
+    postgresql-client \
+    poppler-utils \
+    imagemagick \
+    curl \
+    openssl \
+    openssl-dev \
+    libc6-compat
+
+# Copy package files
+COPY backend/package*.json ./
+COPY backend/prisma ./prisma/
+
+# Install all dependencies
+RUN npm ci && \
+    npm cache clean --force
+
+# --------------------------------------------------
+# STAGE 2: Builder
+# --------------------------------------------------
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+# Copy dependencies from base
+COPY --from=base /app/node_modules ./node_modules
+COPY backend/package*.json ./
+COPY backend/tsconfig.json ./
+COPY backend/src ./src
+COPY backend/prisma ./prisma
+
+# Build TypeScript
+RUN npm run build
+
+# --------------------------------------------------
+# STAGE 3: PDF Worker
+# --------------------------------------------------
+FROM node:20-alpine AS pdf-worker
+WORKDIR /app
+
+# Install runtime dependencies for PDF processing
+RUN apk add --no-cache \
+    postgresql-client \
+    poppler-utils \
+    imagemagick \
+    curl \
+    wget \
+    openssl \
+    libc6-compat
+
+# Create non-root user
+RUN addgroup -g 1001 -S worker && \
+    adduser -S worker -u 1001
+
+# Copy built application and dependencies
+COPY --from=base --chown=worker:worker /app/node_modules ./node_modules
+COPY --from=builder --chown=worker:worker /app/dist ./dist
+COPY --from=builder --chown=worker:worker /app/prisma ./prisma
+COPY --from=base --chown=worker:worker /app/package*.json ./
+
+# Create directories
+RUN mkdir -p /app/pdfs /app/pdfs/processed /app/logs && \
+    chown -R worker:worker /app
+
+# Switch to non-root user
+USER worker
+
+# Set worker type
+ENV WORKER_TYPE=pdf
+ENV NODE_ENV=production
+ENV HEALTH_PORT=3002
+
+# Expose health check port
+EXPOSE 3002
+
+# Health check - Real HTTP endpoint check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+    CMD wget --quiet --tries=1 --spider http://localhost:3002/health || exit 1
+
+# Start PDF worker
+CMD ["node", "dist/workers/runner.js"]
+
+# --------------------------------------------------
+# STAGE 4: Exercise Worker (AI)
+# --------------------------------------------------
+FROM node:20-alpine AS exercise-worker
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apk add --no-cache \
+    postgresql-client \
+    curl \
+    wget \
+    openssl \
+    libc6-compat
+
+# Create non-root user
+RUN addgroup -g 1001 -S worker && \
+    adduser -S worker -u 1001
+
+# Copy built application and dependencies
+COPY --from=base --chown=worker:worker /app/node_modules ./node_modules
+COPY --from=builder --chown=worker:worker /app/dist ./dist
+COPY --from=builder --chown=worker:worker /app/prisma ./prisma
+COPY --from=base --chown=worker:worker /app/package*.json ./
+
+# Create directories
+RUN mkdir -p /app/logs && \
+    chown -R worker:worker /app
+
+# Switch to non-root user
+USER worker
+
+# Set worker type
+ENV WORKER_TYPE=exercise
+ENV NODE_ENV=production
+ENV HEALTH_PORT=3003
+
+# Expose health check port
+EXPOSE 3003
+
+# Health check - Real HTTP endpoint check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+    CMD wget --quiet --tries=1 --spider http://localhost:3003/health || exit 1
+
+# Start exercise worker
+CMD ["node", "dist/workers/runner.js"]
+
+# --------------------------------------------------
+# STAGE 5: Notification Worker (Telegram)
+# --------------------------------------------------
+FROM node:20-alpine AS notification-worker
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apk add --no-cache \
+    postgresql-client \
+    curl \
+    wget \
+    openssl \
+    libc6-compat
+
+# Create non-root user
+RUN addgroup -g 1001 -S worker && \
+    adduser -S worker -u 1001
+
+# Copy built application and dependencies
+COPY --from=base --chown=worker:worker /app/node_modules ./node_modules
+COPY --from=builder --chown=worker:worker /app/dist ./dist
+COPY --from=builder --chown=worker:worker /app/prisma ./prisma
+COPY --from=base --chown=worker:worker /app/package*.json ./
+
+# Create directories
+RUN mkdir -p /app/logs && \
+    chown -R worker:worker /app
+
+# Switch to non-root user
+USER worker
+
+# Set worker type
+ENV WORKER_TYPE=notification
+ENV NODE_ENV=production
+ENV HEALTH_PORT=3004
+
+# Expose health check port
+EXPOSE 3004
+
+# Health check - Real HTTP endpoint check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+    CMD wget --quiet --tries=1 --spider http://localhost:3004/health || exit 1
+
+# Start notification worker
+CMD ["node", "dist/workers/runner.js"]
+
+# --------------------------------------------------
+# METADATA
+# --------------------------------------------------
+LABEL maintainer="math-platform-builders"
+LABEL description="Math Platform Workers (PDF, Exercise, Notification) - Production Ready"
+LABEL version="1.0.0"