feat(tenancy): add member detail modal + fix invite name saving

Merchant team page:
- Consistent member display (full_name + email on every row)
- New view button (eye icon) on all members including owner
- View modal shows account info (username, role, email verified,
  last login, account created) and store memberships with roles
- API enriched with user metadata (username, role, is_email_verified,
  last_login, created_at)

Invite fix (both merchant and store routes):
- first_name and last_name from invite form were never passed to the
  service that creates the User account. Now passed through correctly.

i18n: 6 new keys across 4 locales (view_member, account_information,
username, email_verified, last_login, account_created).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/tenancy/routes/api/merchant.py

@@ -220,6 +220,8 @@ async def merchant_team_invite(
                 inviter=inviter,
                 email=data.email,
                 role_name=data.role_name,
+                first_name=data.first_name,
+                last_name=data.last_name,
             )
             results.append(MerchantTeamInviteResult(
                 store_id=store.id,