[ADD] membership_status_in_portal: portal membership status badge

Add a generic module displaying the connected portal user's membership
status in the account sidebar, below the "Edit information" link.

The native Odoo membership label (``res.partner.membership_state`` from
the ``membership`` module) is shown as a colored badge:
- green (``text-bg-success``) for free / paid members;
- yellow (``text-bg-warning``) for waiting / invoiced members;
- red (``text-bg-danger``) otherwise.

Color, icon and label are computed in the QWeb template; no model or
field is added. Includes HttpCase tests covering member and non-member
rendering and asserting no action button is rendered.

membership_status_in_portal/__manifest__.py

@@ -0,0 +1,23 @@
+# Copyright 2026 Stéphan Sainléger (Elabore)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+    "name": "membership_status_in_portal",
+    "version": "18.0.1.0.0",
+    "author": "Elabore",
+    "maintainer": "Elabore",
+    "website": "https://git.elabore.coop/elabore/member-tools",
+    "license": "AGPL-3",
+    "category": "Website",
+    "summary": "Display the membership status of portal users",
+    "depends": [
+        "portal",
+        "membership",
+    ],
+    "data": [
+        "views/portal_sidebar.xml",
+    ],
+    "installable": True,
+    "auto_install": False,
+    "application": False,
+}