Let me answer this one plainly. NoÖ harvesting is not its own sphere. It is a skill set linked to adventuring as you will have to go out into the world in dangerous areas to retrieve resources of varying types. I know there has been some confusion about this so I figured I would put it to bed here since the question is being asked so bluntly.
Yes. You can craft and harvest without fighting. You can craft to max level without adventuring in any way. Crafting and harvesting are clearly defined seperate activities in Vanguard. - 16 November 2005