feat: complete all backend endpoints and frontend features

Backend:
- UpdateTaskUseCase for editing task basic info
- PATCH /tasks/{id} endpoint for task updates
- UpdateTaskRequest model with optional fields
- Full CRUD operations for tasks

Frontend:
- EditTaskForm now uses real API (PATCH /tasks/{id})
- Task detail page shows edit form when edit button clicked
- Status/progress update with real-time API calls
- Issue resolution with real-time refresh
- All forms integrated with backend

Tests:
- Added test_update_task for partial and full updates
- 9 integration tests passing (was 8)
- Full coverage of task CRUD operations

All features complete and tested!

apps/api/app/api/routes/project_management.py

@@ -11,6 +11,7 @@ from packages.adapters.in_memory.project_management_repositories import (
     InMemoryTaskRepository,
 )
 from packages.application.get_task_detail_use_case import GetTaskDetailUseCase
+from packages.application.update_task_use_case import UpdateTaskUseCase
 from packages.application.project_management_use_cases import (
     CreateMilestoneUseCase,
     CreateTaskIssueUseCase,
@@ -77,6 +78,13 @@ class TaskResponse(BaseModel):
     updated_at: datetime
 
 
+class UpdateTaskRequest(BaseModel):
+    name: str | None = None
+    description: str | None = None
+    priority: str | None = None
+    assignee_user_id: str | None = None
+
+
 class UpdateTaskStatusRequest(BaseModel):
     status: TaskStatus
 
@@ -232,6 +240,45 @@ def get_task(
     )
 
 
+@router.patch("/tasks/{task_id}", response_model=TaskResponse)
+def update_task(
+    task_id: str,
+    req: UpdateTaskRequest,
+    task_repo=Depends(get_task_repo),
+):
+    """更新任务基本信息"""
+    use_case = UpdateTaskUseCase(task_repo)
+    try:
+        task = use_case.execute(
+            task_id=task_id,
+            name=req.name,
+            description=req.description,
+            priority=req.priority,
+            assignee_user_id=req.assignee_user_id,
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e))
+    return TaskResponse(
+        id=task.id,
+        project_id=task.project_id,
+        workspace_id=task.workspace_id,
+        name=task.name,
+        description=task.description,
+        status=task.status,
+        priority=task.priority,
+        parent_task_id=task.parent_task_id,
+        assignee_user_id=task.assignee_user_id,
+        progress=task.progress,
+        planned_start_date=task.planned_start_date,
+        planned_end_date=task.planned_end_date,
+        actual_start_date=task.actual_start_date,
+        actual_end_date=task.actual_end_date,
+        tags=task.tags,
+        created_at=task.created_at,
+        updated_at=task.updated_at,
+    )
+
+
 @router.patch("/tasks/{task_id}/status", response_model=TaskResponse)
 def update_task_status(
     task_id: str,