I'm not aware of any app for Vancouver street problems but I have bookmarked this page:
It links on to several categories with reporting forms, including Street Lights, Street Repairs, Traffic Light problems, Streets, Utilities & Public Spaces, and some others. Not as convenient as a app but it works on my 'droid. I'm satisfied with the response times when I've used it for burned out or flickering street lights, street sweeping and cutting back brush from sidewalks and bike lanes...within a week.
in case you need to type it in, given the way this forum hides long urls...