refactor(board): delete old board routes, absorb slackHandle into profile PATCH

- Delete server/api/members/me/board.patch.js and server/api/board/suggestions.get.js
- Add boardSlackHandle to memberProfileUpdateSchema; remove boardPrivacy
- profile.patch.js: write boardSlackHandle -> board.slackHandle; drop boardPrivacy
- Remove privacy.board field from Member model
- onboarding/status.get.js: hasProfileTags now requires only craftTags; hasEngagedBoard uses BoardPost.exists
- onboarding/track.post.js: graduation check uses BoardPost.exists instead of board.topics elemMatch
- members/[id].get.js and directory.get.js: reduce board response to slackHandle only; drop connectionTag and peerSupport filters

server/api/members/profile.patch.js

@@ -32,7 +32,6 @@ export default defineEventHandler(async (event) => {
     "locationPrivacy",
     "socialLinksPrivacy",
     "craftTagsPrivacy",
-    "boardPrivacy",
   ];
 
   // Build update object from validated data
@@ -49,6 +48,11 @@ export default defineEventHandler(async (event) => {
     updateData.craftTags = body.craftTags;
   }
 
+  // Handle board slack handle
+  if (body.boardSlackHandle !== undefined) {
+    updateData["board.slackHandle"] = body.boardSlackHandle;
+  }
+
   // Handle privacy settings
   privacyFields.forEach((privacyField) => {
     if (body[privacyField] !== undefined) {