feat(faq): refine category icons and project faq flows

backend/app/crud/faq_item.py

@@ -26,7 +26,6 @@ async def create_item(db: AsyncSession, item_in: FaqCreate, *, created_by: uuid.
         answer=item_in.answer or "",
         status="PENDING",
         version=1,
-        is_active=True,
         created_by=created_by,
     )
     db.add(item)
@@ -46,7 +45,6 @@ async def list_items(
     study_id: uuid.UUID | None,
     category_id: uuid.UUID | None = None,
     keyword: str | None = None,
-    is_active: bool | None = True,
     study_scope: str | None = "project",
 ) -> Sequence[FaqItem]:
     stmt = select(FaqItem).join(FaqCategory, FaqCategory.id == FaqItem.category_id)
@@ -69,8 +67,6 @@ async def list_items(
                 FaqItem.keywords.ilike(like_pattern),
             )
         )
-    if is_active is not None:
-        stmt = stmt.where(FaqItem.is_active == is_active)
     result = await db.execute(stmt)
     return result.scalars().all()