feat: Implement initial Go backend and React frontend project structure for the gotail application.

Dockerfile

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+# Stage 1: Build Frontend
+FROM node:20-alpine AS frontend-builder
+
+WORKDIR /app/frontend
+
+# Copy package files
+COPY frontend/package*.json ./
+
+# Install dependencies
+RUN npm ci --legacy-peer-deps
+
+# Copy source
+COPY frontend/ ./
+
+# Build
+RUN npm run build
+
+# Stage 2: Build Backend
+FROM golang:1.24-alpine AS backend-builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apk add --no-cache git
+
+# Copy go mod files
+COPY backend/go.mod backend/go.sum ./
+
+# Download dependencies
+RUN go mod download
+
+# Copy backend source
+COPY backend/ ./
+
+# Copy frontend build
+COPY --from=frontend-builder /app/frontend/dist ./dist/
+
+# Build binary
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s -X main.version=2.0.0" -o /web-tail-pro ./cmd/server
+
+# Stage 3: Runtime
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates tzdata
+
+WORKDIR /app
+
+# Copy binary
+COPY --from=backend-builder /web-tail-pro /app/web-tail-pro
+
+# Create non-root user
+RUN addgroup -g 1000 webtail && \
+    adduser -D -u 1000 -G webtail webtail && \
+    chown -R webtail:webtail /app
+
+USER webtail
+
+EXPOSE 8080
+
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD wget --quiet --tries=1 --spider http://localhost:8080/health || exit 1
+
+ENTRYPOINT ["/app/web-tail-pro"]