feat: add ops center and node onboarding flow

docs/schemas/ops_doctor_decision_contract.md

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+# ops_doctor_decision_contract
+
+## Purpose
+
+冻结 `doctor-decision` 主决策 contract，让页面、CLI、Codex 都消费同一份“当前先看哪一面、先执行什么动作、为什么”的正式结论。
+
+## Producer
+
+- backend service `app.services.ops_service.get_ops_doctor_decision`
+- API `GET /api/v1/ops/doctor-decision`
+
+## Primary Consumers
+
+- `domain-web` Ops Center 顶部总检入口与主决策详情面板
+- `domain-api/deploy/multi-region/drive_ops_center.sh doctor-decision`
+- 海外 Codex 驾驶员 / 自动驾驶策略层
+
+## Required Payload
+
+- `status`
+- `status_label`
+- `headline`
+- `detail`
+- `decision`
+- `summary`
+- `recommended_commands`
+- `contract_navigation`
+
+## Decision Shape
+
+- `decision.status`
+- `decision.reason_code`
+- `decision.headline`
+- `decision.detail`
+- `decision.preferred_surface`
+- `decision.next_action_code`
+- `decision.recommended_commands`
+
+## Summary Shape
+
+- `summary.required_failures`
+- `summary.optional_unavailable`
+- `summary.scene_log_reports_total`
+- `summary.scene_log_reports_ok`
+- `summary.scene_log_status_counts`
+- `summary.scene_log_problem_node_codes`
+- `summary.contract_surface_gaps`
+- `summary.launchpad_recommended_target_node_code`
+- `summary.launchpad_recommended_recovery_label`
+- `summary.launchpad_recommended_recovery_summary`
+
+## Notes
+
+- 优先读取最新 `go-live bundle` 中的 `doctor_decision` 产物。
+- 如果 bundle 尚未导出，后端必须回落到 live `stack-diagnosis + go-live-summary` 兜底，而不是直接返回空。
+- `preferred_surface` 必须稳定可消费，不能把面板跳转逻辑继续留给前端猜测。