feat: add default columns to ego.json

Initialize ego.json with default columns on first install:
- columns (Agent Scope): default-username, name, discord-id, email, role,
  position, date-of-birth, agent-id, gender
- public-columns (Public Scope): git-host, keycloak-host

install.mjs

@@ -296,13 +296,13 @@ async function install() {
   // Initialize ego.json if it doesn't exist
   const egoJsonPath = join(openclawPath, 'ego.json');
   if (!existsSync(egoJsonPath)) {
-    const emptyEgo = {
-      columns: [],
-      'public-columns': [],
+    const defaultEgo = {
+      columns: ['default-username', 'name', 'discord-id', 'email', 'role', 'position', 'date-of-birth', 'agent-id', 'gender'],
+      'public-columns': ['git-host', 'keycloak-host'],
       'public-scope': {},
       'agent-scope': {},
     };
-    writeFileSync(egoJsonPath, JSON.stringify(emptyEgo, null, 2) + '\n', { mode: 0o644 });
+    writeFileSync(egoJsonPath, JSON.stringify(defaultEgo, null, 2) + '\n', { mode: 0o644 });
     logOk('Created ego.json');
   } else {
     logOk('ego.json already exists');