refactor(community): rename Community Connections → Community Ecology

Simplify the feature to pure discovery (filter by topic, see matching
members, copy Slack handle). Drop the connection request/confirm flow
entirely — Connection model, 7 API endpoints, useConnections composable,
and TagInput component deleted.

- Rename communityConnections → communityEcology in schema, API, pages
- Delete legacy fields: offering, lookingFor, peerSupport
- New /ecology page, /api/ecology/suggestions, community-ecology.patch
- Nav: "Connections" → "Ecology", remove pending-count badge
- Fix auth/member.get.js missing craftTags + communityEcology
- Add community_ecology_updated activity log type
- Expose slackHandle conditionally when offerPeerSupport is true
- Add migration script at scripts/migrate-to-ecology.js (run before deploy)

app/utils/activityText.js

@@ -76,6 +76,10 @@ const formatters = {
     text: 'Updated community connections',
     icon: 'i-lucide-users'
   }),
+  community_ecology_updated: () => ({
+    text: 'Updated community ecology',
+    icon: 'i-lucide-users'
+  }),
   connection_requested: (m) => ({
     text: `Sent connection request to ${m.memberName || 'a member'}`,
     icon: 'i-lucide-user-plus'