feat: transmission-manager — Go SPA for Transmission RPC

Dockerfile

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+FROM golang:1.24-alpine AS builder
+WORKDIR /app
+COPY go.mod ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o transmission-manager .
+
+FROM alpine:latest
+RUN apk add --no-cache ca-certificates
+WORKDIR /app
+COPY --from=builder /app/transmission-manager .
+EXPOSE 8080
+CMD ["./transmission-manager"]