rename communityEcology → board across backend

Model, schemas, API routes, activity log, and all server handlers
updated. Old ecology/ and community-ecology routes removed, new
board/ routes added. Tests updated and new board-suggestions tests
written (10 cases).

server/models/activityLog.js

@@ -17,7 +17,7 @@ const ACTIVITY_TYPES = [
   'slack_invited',
   'email_sent',
   'community_connections_updated',
-  'community_ecology_updated',
+  'board_updated',
   'connection_requested',
   'connection_confirmed',
   'tag_suggested'

server/models/member.js

@@ -72,7 +72,7 @@ const memberSchema = new mongoose.Schema({
   showInDirectory: { type: Boolean, default: true },
 
   craftTags: [String],
-  communityEcology: {
+  board: {
     topics: [
       {
         tagSlug: String,
@@ -128,7 +128,7 @@ const memberSchema = new mongoose.Schema({
       enum: ["public", "members", "private"],
       default: "members",
     },
-    communityEcology: {
+    board: {
       type: String,
       enum: ["public", "members", "private"],
       default: "members",
@@ -155,7 +155,7 @@ const memberSchema = new mongoose.Schema({
   onboarding: {
     completedAt: { type: Date, default: null },
     eventPageVisited: { type: Boolean, default: false },
-    ecologyPageVisited: { type: Boolean, default: false },
+    boardPageVisited: { type: Boolean, default: false },
     wikiClicked: { type: Boolean, default: false },
   },