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/pages/admin/members/[id].vue

@@ -351,13 +351,13 @@ function statusClass(status) {
 const hasProfileTags = computed(() => {
   const m = member.value
   if (!m) return false
-  return m.craftTags?.length > 0 && m.communityEcology?.topics?.length > 0
+  return m.craftTags?.length > 0 && m.board?.topics?.length > 0
 })
 
 const hasEcologyEngaged = computed(() => {
   const m = member.value
   if (!m) return false
-  return m.onboarding?.ecologyPageVisited && m.communityEcology?.topics?.some(
+  return m.onboarding?.boardPageVisited && m.board?.topics?.some(
     t => ['help', 'interested', 'seeking'].includes(t.state)
   )
 })