fix(sprints): move velocity endpoint before {sprint_id} routes

FastAPI processes routes in order, so /velocity must be defined
before /{sprint_id} to prevent "velocity" from being parsed as a UUID.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/api/routes/sprints.py

@@ -384,6 +384,68 @@ async def get_active_sprint(
         raise
 
 
+@router.get(
+    "/velocity",
+    response_model=list[SprintVelocity],
+    summary="Get Project Velocity",
+    description="""
+    Get velocity metrics for completed sprints in the project.
+
+    **Authentication**: Required (Bearer token)
+    **Authorization**: Project owner or superuser
+
+    Returns velocity data for the last N completed sprints (default 5).
+    Useful for capacity planning and sprint estimation.
+
+    **Rate Limit**: 60 requests/minute
+    """,
+    operation_id="get_project_velocity",
+)
+@limiter.limit(f"{60 * RATE_MULTIPLIER}/minute")
+async def get_project_velocity(
+    request: Request,
+    project_id: UUID,
+    limit: int = Query(
+        default=5,
+        ge=1,
+        le=20,
+        description="Number of completed sprints to include",
+    ),
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+) -> Any:
+    """
+    Get velocity metrics for completed sprints.
+
+    Returns planned points, actual velocity, and velocity ratio
+    for the last N completed sprints, ordered chronologically.
+    """
+    # Verify project access
+    await verify_project_ownership(db, project_id, current_user)
+
+    try:
+        velocity_data = await sprint_crud.get_velocity(
+            db, project_id=project_id, limit=limit
+        )
+
+        return [
+            SprintVelocity(
+                sprint_number=item["sprint_number"],
+                sprint_name=item["sprint_name"],
+                planned_points=item["planned_points"],
+                velocity=item["velocity"],
+                velocity_ratio=item["velocity_ratio"],
+            )
+            for item in velocity_data
+        ]
+
+    except Exception as e:
+        logger.error(
+            f"Error getting velocity for project {project_id}: {e!s}", exc_info=True
+        )
+        raise
+
+
 @router.get(
     "/{sprint_id}",
     response_model=SprintResponse,
@@ -1116,70 +1178,3 @@ async def remove_issue_from_sprint(
             exc_info=True,
         )
         raise
-
-
-# ============================================================================
-# Sprint Metrics Endpoints
-# ============================================================================
-
-
-@router.get(
-    "/velocity",
-    response_model=list[SprintVelocity],
-    summary="Get Project Velocity",
-    description="""
-    Get velocity metrics for completed sprints in the project.
-
-    **Authentication**: Required (Bearer token)
-    **Authorization**: Project owner or superuser
-
-    Returns velocity data for the last N completed sprints (default 5).
-    Useful for capacity planning and sprint estimation.
-
-    **Rate Limit**: 60 requests/minute
-    """,
-    operation_id="get_project_velocity",
-)
-@limiter.limit(f"{60 * RATE_MULTIPLIER}/minute")
-async def get_project_velocity(
-    request: Request,
-    project_id: UUID,
-    limit: int = Query(
-        default=5,
-        ge=1,
-        le=20,
-        description="Number of completed sprints to include",
-    ),
-    current_user: User = Depends(get_current_user),
-    db: AsyncSession = Depends(get_db),
-) -> Any:
-    """
-    Get velocity metrics for completed sprints.
-
-    Returns planned points, actual velocity, and velocity ratio
-    for the last N completed sprints, ordered chronologically.
-    """
-    # Verify project access
-    await verify_project_ownership(db, project_id, current_user)
-
-    try:
-        velocity_data = await sprint_crud.get_velocity(
-            db, project_id=project_id, limit=limit
-        )
-
-        return [
-            SprintVelocity(
-                sprint_number=item["sprint_number"],
-                sprint_name=item["sprint_name"],
-                planned_points=item["planned_points"],
-                velocity=item["velocity"],
-                velocity_ratio=item["velocity_ratio"],
-            )
-            for item in velocity_data
-        ]
-
-    except Exception as e:
-        logger.error(
-            f"Error getting velocity for project {project_id}: {e!s}", exc_info=True
-        )
-        raise