任務在規劃頁上開，流程圖只管先後順序

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sequenceDiagram
    participant PM as PM（規劃頁）
    participant API as 後端端點<br/>job_route.py:170
    participant SVC as 任務服務<br/>job_service.py:117
    participant REPO as 任務倉儲<br/>repo_impl.py:673
    participant XML as 流程圖改圖<br/>jedi-flow-engine
    participant DB as 資料庫

    PM->>API: 按「新增任務」（只帶名稱，不帶節點編號）
    API->>SVC: create_job(ao_uid, name, job_element_uid=None)
    SVC->>SVC: 檢查是不是專案 manager
    SVC->>REPO: create_job(...)
    Note over REPO: 現況：沒帶編號就 return None<br/>本案：改成往下走
    REPO->>DB: 查這個查核項目的流程範本與流程實例
    REPO->>XML: 依現有拓樸決定插法<br/>（重排成平行 / 掛新分支）
    XML-->>REPO: 新 XML ＋ 新節點編號
    REPO->>DB: 建 job_executions 一筆
    REPO->>XML: inject_job_execution_uid(新節點, 新任務編號)
    REPO->>DB: 寫回範本 XML（主表＋翻譯表）
    REPO-->>SVC: 任務資料
    SVC-->>API: 任務資料
    API-->>PM: 200，任務面板出現、預設展開待填

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flowchart TB
    subgraph A["情境一：只有一個任務（專案啟動後的預設樣子）"]
      direction LR
      A1([開始]) --> A2[任務 1] --> A3([結束])
      A3 -.新增任務 2.-> A4[" "]
      A5([開始]) --> A6{{分叉}}
      A6 --> A7[任務 1]
      A6 --> A8[任務 2 新]
      A7 --> A9{{合流}}
      A8 --> A9
      A9 --> A10([結束])
    end

    subgraph B["情境二：已是標準平行（再加一個）"]
      direction LR
      B1([開始]) --> B2{{分叉}}
      B2 --> B3[任務 1]
      B2 --> B4[任務 2]
      B3 --> B5{{合流}}
      B4 --> B5
      B5 --> B6([結束])
      B6 -.新增任務 3.-> B7[" "]
      B8{{分叉}} --> B9[任務 1]
      B8 --> B10[任務 2]
      B8 --> B11[任務 3 新]
      B9 --> B12{{合流}}
      B10 --> B12
      B11 --> B12
    end

    subgraph C["情境三：使用者手動排成一條龍（不動他的順序）"]
      direction LR
      C1([開始]) --> C2[任務 1] --> C3[任務 2] --> C4{{合流}} --> C5([結束])
      C4 -.新增任務 3.-> C6[" "]
      C7[任務 1] --> C8[任務 2] --> C9{{合流}}
      C10{{分叉}} --> C11[任務 3 新] --> C9
    end