feat: add step thumbs feedback and /ratings alias routes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/api/endpoints/steps.py

@@ -554,6 +554,42 @@ async def delete_rating(
     return None
 
 
+# Backward-compatible /ratings alias routes
+@router.post("/{step_id}/ratings", response_model=StepRatingResponse, status_code=201,
+             include_in_schema=False)
+async def rate_step_alias(
+    step_id: UUID,
+    rating_data: StepRatingCreate,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_active_user)
+):
+    """Alias for POST /{step_id}/rate."""
+    return await rate_step(step_id, rating_data, db, current_user)
+
+
+@router.put("/{step_id}/ratings", response_model=StepRatingResponse,
+            include_in_schema=False)
+async def update_rating_alias(
+    step_id: UUID,
+    rating_data: StepRatingUpdate,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_active_user)
+):
+    """Alias for PUT /{step_id}/rate."""
+    return await update_rating(step_id, rating_data, db, current_user)
+
+
+@router.delete("/{step_id}/ratings", status_code=204,
+               include_in_schema=False)
+async def delete_rating_alias(
+    step_id: UUID,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_active_user)
+):
+    """Alias for DELETE /{step_id}/rate."""
+    return await delete_rating(step_id, db, current_user)
+
+
 @router.get("/{step_id}/reviews", response_model=list[StepRatingResponse])
 async def get_reviews(
     step_id: UUID,