refactor(peer-support): delete provably dead code (Phase 1)

The Skills Exchange + Peer Support feature was replaced by Community
Connections on 2026-04-05, but several files and code paths were left
in place as backward-compat. None are reachable from the live UI:

- usePeerSupport.js composable: not imported anywhere
- PeerSupportBadge.vue: not imported anywhere
- peer-support.vue: stub redirect with no incoming links
- /api/peer-support.get.js: only consumed by usePeerSupport
- /api/members/me/peer-support.patch.js: same
- profile.patch.js offering/lookingFor write branches: profile form
  no longer sends these fields (only writes communityConnections.*)
- PEER_SUPPORT_ENABLED/DISABLED activity types and renderers: only
  written by the deleted peer-support.patch endpoint. The activityText
  formatter has a fallback for unknown types so existing records
  still display ("peer support enabled" with a generic icon).

Tests updated to drop peerSupportUpdateSchema coverage and the
offering/lookingFor passthrough assertion.

schemas.js cleanup deferred — concurrent communityConnections →
communityEcology rename is in flight in the working tree.

server/api/members/profile.patch.js

@@ -31,8 +31,6 @@ export default defineEventHandler(async (event) => {
     "bioPrivacy",
     "locationPrivacy",
     "socialLinksPrivacy",
-    "offeringPrivacy",
-    "lookingForPrivacy",
     "craftTagsPrivacy",
     "communityConnectionsPrivacy",
   ];
@@ -51,20 +49,6 @@ export default defineEventHandler(async (event) => {
     updateData.craftTags = body.craftTags;
   }
 
-  // Handle offering and lookingFor separately (nested objects)
-  if (body.offering !== undefined) {
-    updateData.offering = {
-      text: body.offering.text || "",
-      tags: body.offering.tags || [],
-    };
-  }
-  if (body.lookingFor !== undefined) {
-    updateData.lookingFor = {
-      text: body.lookingFor.text || "",
-      tags: body.lookingFor.tags || [],
-    };
-  }
-
   // Handle privacy settings
   privacyFields.forEach((privacyField) => {
     if (body[privacyField] !== undefined) {
@@ -107,8 +91,6 @@ export default defineEventHandler(async (event) => {
       bio: member.bio,
       location: member.location,
       socialLinks: member.socialLinks,
-      offering: member.offering,
-      lookingFor: member.lookingFor,
       craftTags: member.craftTags,
       showInDirectory: member.showInDirectory,
       notifications: member.notifications,