feat: add Timeweb Cloud provider for Woodpecker CI autoscaler

- Implement timewebcloud provider with DeployAgent, RemoveAgent, ListDeployedAgentNames
- Add minimal HTTP API client for Timeweb Cloud (create/list/delete servers)
- Register provider in main.go with CLI flags
- Add timeweb-list and timeweb-tester utilities
- Include Dockerfile and docker-compose.yml for deployment
- Update DEPLOY.md with verified OS/preset IDs

Dockerfile

@@ -0,0 +1,17 @@
+FROM golang:1.23-alpine AS builder
+
+WORKDIR /build
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN GOMAXPROCS=1 go build -p 1 -o woodpecker-autoscaler ./cmd/woodpecker-autoscaler
+
+FROM alpine:latest
+
+RUN apk add --no-cache ca-certificates
+
+WORKDIR /app
+COPY --from=builder /build/woodpecker-autoscaler /usr/local/bin/
+
+ENTRYPOINT ["woodpecker-autoscaler"]