fix(sidecar): bump Docker API version from 1.43 to 1.44

Docker Engine 29.0.4 on Netcup requires minimum API version 1.44,
causing all sidecar starts (Blender, FreeCAD, KiCad, Ollama) to fail
with "client version 1.43 is too old".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/sidecar-manager.ts

@@ -81,7 +81,7 @@ function dockerApi(method: string, path: string, sendBody?: boolean): Promise<{
 		const req = http.request(
 			{
 				socketPath: DOCKER_SOCKET,
-				path: `/v1.43${path}`,
+				path: `/v1.44${path}`,
 				method,
 				headers,
 			},