refactor: update milestone/task status enums to new state machine values

Milestone: open/freeze/undergoing/completed/closed (was open/pending/deferred/progressing/closed)
Task: open/pending/undergoing/completed/closed (was open/pending/progressing/closed)

- Add MilestoneStatusEnum to schemas with typed validation
- Add started_at field to Milestone model
- Update all router/CLI references from progressing->undergoing
- Add completed status handling in task transition logic

app/api/routers/milestones.py

@@ -111,8 +111,8 @@ def create_milestone_task(project_id: int, milestone_id: int, task_data: schemas
     if not milestone:
         raise HTTPException(status_code=404, detail="Milestone not found")
     
-    if milestone.status and hasattr(milestone.status, 'value') and milestone.status.value == "progressing":
-        raise HTTPException(status_code=400, detail="Cannot add items to a milestone that is in_progress")
+    if milestone.status and hasattr(milestone.status, 'value') and milestone.status.value == "undergoing":
+        raise HTTPException(status_code=400, detail="Cannot add items to a milestone that is undergoing")
     
     # Generate task_code
     milestone_code = milestone.milestone_code or f"m{milestone.id}"

app/api/routers/misc.py

@@ -425,8 +425,8 @@ def create_milestone_task(project_code: str, milestone_id: int, task_data: dict,
     if not ms:
         raise HTTPException(status_code=404, detail="Milestone not found")
     
-    if ms.status and hasattr(ms.status, "value") and ms.status.value == "progressing":
-        raise HTTPException(status_code=400, detail="Cannot add items to a milestone that is in_progress")
+    if ms.status and hasattr(ms.status, "value") and ms.status.value == "undergoing":
+        raise HTTPException(status_code=400, detail="Cannot add items to a milestone that is undergoing")
     
     milestone_code = ms.milestone_code or f"m{ms.id}"
     max_task = db.query(Task).filter(Task.milestone_id == ms.id).order_by(Task.id.desc()).first()
@@ -504,8 +504,8 @@ def create_support(project_code: str, milestone_id: int, support_data: dict, db:
     if not ms:
         raise HTTPException(status_code=404, detail="Milestone not found")
     
-    if ms.status and hasattr(ms.status, "value") and ms.status.value == "progressing":
-        raise HTTPException(status_code=400, detail="Cannot add items to a milestone that is in_progress")
+    if ms.status and hasattr(ms.status, "value") and ms.status.value == "undergoing":
+        raise HTTPException(status_code=400, detail="Cannot add items to a milestone that is undergoing")
     
     milestone_code = ms.milestone_code or f"m{ms.id}"
     max_support = db.query(Support).filter(Support.milestone_id == milestone_id).order_by(Support.id.desc()).first()
@@ -563,8 +563,8 @@ def create_meeting(project_code: str, milestone_id: int, meeting_data: dict, db:
     if not ms:
         raise HTTPException(status_code=404, detail="Milestone not found")
     
-    if ms.status and hasattr(ms.status, "value") and ms.status.value == "progressing":
-        raise HTTPException(status_code=400, detail="Cannot add items to a milestone that is in_progress")
+    if ms.status and hasattr(ms.status, "value") and ms.status.value == "undergoing":
+        raise HTTPException(status_code=400, detail="Cannot add items to a milestone that is undergoing")
     
     milestone_code = ms.milestone_code or f"m{ms.id}"
     max_meeting = db.query(Meeting).filter(Meeting.milestone_id == milestone_id).order_by(Meeting.id.desc()).first()

app/api/routers/tasks.py

@@ -167,9 +167,9 @@ def update_task(task_id: int, task_update: schemas.TaskUpdate, db: Session = Dep
     update_data = task_update.model_dump(exclude_unset=True)
     if "status" in update_data:
         new_status = update_data["status"]
-        if new_status == "progressing" and not task.started_on:
+        if new_status == "undergoing" and not task.started_on:
             task.started_on = datetime.utcnow()
-        if new_status == "closed" and not task.finished_on:
+        if new_status in ("closed", "completed") and not task.finished_on:
             task.finished_on = datetime.utcnow()
     
     for field, value in update_data.items():
@@ -202,9 +202,9 @@ def transition_task(task_id: int, new_status: str, bg: BackgroundTasks, db: Sess
     if not task:
         raise HTTPException(status_code=404, detail="Task not found")
     old_status = task.status.value if hasattr(task.status, 'value') else task.status
-    if new_status == "progressing" and not task.started_on:
+    if new_status == "undergoing" and not task.started_on:
         task.started_on = datetime.utcnow()
-    if new_status == "closed" and not task.finished_on:
+    if new_status in ("closed", "completed") and not task.finished_on:
         task.finished_on = datetime.utcnow()
     task.status = new_status
     db.commit()