v1.8: FastAdmin chathub-addon — register/plan/payment/member-center + 5 channel bindings

- New fastadmin/chathub/ (11 files, 204K): user-facing FastAdmin ThinkPHP 5 addon
- _markOrderPaid() now calls _provisionAsync() on empty embed_code (closes 'paid but no code' gap)
- New reprovision() action — user-initiated resource rebuild
- payReturn() smart redirect: 3 branches (just_paid / provisioning / pending / fallback)
- status badge updated with 'provisioning' state (blue)
- _initialize() whitelist expanded: reprovision (user) + payNotify/payReturn (public webhook)
- 5 chathub_* tables (tenant/log/order/channel_account/gateway_log) + MIGRATIONS.md

Bugfixes during E2E:
- payNotify HTTP 500: tenant.status ENUM missing 'provisioning' value (DBA migration)
- payNotify HTTP 500: chathub_log.status='received' (not in ENUM) — changed to 'success'
- TP5 method signature: function reprovision(\$ids) does not read query string — use \$this->request->param('ids')

fastadmin/chathub/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 GreatQiu
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.