Initial commit: Plataforma de Economía

Features:
- React 18 + TypeScript frontend with Vite
- Go + Gin backend API
- PostgreSQL database
- JWT authentication with refresh tokens
- User management (admin panel)
- Docker containerization
- Progress tracking system
- 4 economic modules structure

Fixed:
- Login with username or email
- User creation without required email
- Database nullable timestamps
- API response field naming

backend/Dockerfile

@@ -0,0 +1,33 @@
+FROM golang:1.23-alpine AS builder
+
+WORKDIR /app
+
+# Install dependencies
+RUN apk add --no-cache git
+
+# Copy go mod files
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build binary
+RUN CGO_ENABLED=0 GOOS=linux go build -o /server ./cmd/server
+
+# Final stage
+FROM alpine:3.19
+
+WORKDIR /app
+
+# Install ca-certificates for HTTPS
+RUN apk add --no-cache ca-certificates
+
+# Copy binary from builder
+COPY --from=builder /server .
+
+# Expose port
+EXPOSE 8080
+
+# Run the binary
+CMD ["./server"]