Rename communityEcology → board across frontend, add Board nav, update redirects

- Add Board to exploreItems in AppNavigation
- Update ecology.vue + connections.vue redirects to /board
- Rename all communityEcology refs to board in member profiles, dashboard, admin, onboarding
- Update API path /api/members/me/community-ecology → /api/members/me/board

app/components/AppNavigation.vue

@@ -210,6 +210,7 @@ const youItems = [
 const exploreItems = [
   { label: "Events", path: "/events" },
   { label: "Members", path: "/members" },
+  { label: "Board", path: "/board" },
   { label: "Wiki", path: "https://wiki.ghostguild.org", external: true },
   { label: "About", path: "/about" },
 ];