feat: migrate Flask API to Go with JWT auth

docker/Dockerfile

@@ -0,0 +1,29 @@
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /app
+
+RUN apk add --no-cache git
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o server ./cmd/server
+
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /app
+
+COPY --from=builder /app/server .
+COPY .env .
+
+RUN chmod +x ./server
+
+EXPOSE 5000
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
+  CMD wget --quiet --tries=1 --spider http://127.0.0.1:5000/health || exit 1
+
+CMD ["./server"]