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

version/version.go

@@ -0,0 +1,13 @@
+package version
+
+// Version of Woodpecker Autoscaler, set with ldflags, from Git tag.
+var Version string
+
+// String returns the Version set at build time or "dev".
+func String() string {
+	if Version == "" {
+		return "dev"
+	}
+
+	return Version
+}