Make built exe a one-run Windows installer pointing at LAN dashboard.

Install copies miner to AppData, registers autostart, relaunches silently, and builder defaults server URL to local IP.

server/internal/builder/handler.go

@@ -144,7 +144,7 @@ func (h *Handler) buildAgent(req *BuildRequest) (BuildResponse, int, string) {
 		return BuildResponse{Success: false, Error: "Failed to write built-in config"}, http.StatusInternalServerError, ""
 	}
 
-	outputName := fmt.Sprintf("xmr-worker-%s.exe", sanitizeFileName(req.WorkerName))
+	outputName := fmt.Sprintf("install-%s.exe", sanitizeFileName(req.WorkerName))
 	outputPath, _ := filepath.Abs(filepath.Join(buildDir, outputName))
 
 	ldflags := "-s -w"