Initial commit: web-app boilerplate with auth, OIDC/SSO, admin panel, i18n

Rust (cot framework) + PostgreSQL boilerplate providing:

- Session-based auth with Admin/User roles
- OIDC/SSO login with PKCE, group-to-role mapping, auto-provisioning
- Admin panel: user management, settings, debug/config inspector
- 3-tier config system (compiled default → DB → FURU_* env vars)
- i18n (English + Russian) with compile-time translations macro
- JSON API skeleton (GET /api/me)
- DB-backed sessions (survive server restarts)

Co-Authored-By: Claude <noreply@anthropic.com>

templates/admin/users.html

@@ -0,0 +1,37 @@
+{% extends "admin/layout.html" %}
+{% block admin_title %}{{ t.nav_users }}{% endblock admin_title %}
+
+{% block content %}
+<h1>{{ t.users_heading }}</h1>
+
+<p style="margin-bottom: 1rem;">
+    <a href="/admin/users/new" style="display:inline-block; padding:.5rem 1rem; background:#1a1a2e; color:#fff; text-decoration:none; border-radius:4px;">{{ t.users_add }}</a>
+</p>
+
+<table>
+    <tr>
+        <th>{{ t.users_username }}</th>
+        <th>{{ t.users_email }}</th>
+        <th>{{ t.users_display_name }}</th>
+        <th>{{ t.users_role }}</th>
+        <th>{{ t.users_active }}</th>
+        <th>{{ t.users_actions }}</th>
+    </tr>
+    {% for u in users %}
+    <tr>
+        <td>{{ u.username_str() }}</td>
+        <td>{{ u.email_str() }}</td>
+        <td>{{ u.display_name_str() }}</td>
+        <td>{{ u.role_str() }}</td>
+        <td>{{ u.is_active() }}</td>
+        <td>
+            <a href="/admin/users/{{ u.id_val() }}/edit">{{ t.users_edit }}</a>
+            &nbsp;|&nbsp;
+            <form method="post" action="/admin/users/{{ u.id_val() }}/delete" style="display:inline;" onsubmit="return confirm('{{ t.users_delete_confirm }}')">
+                <button type="submit" style="background:none; border:none; color:#c00; cursor:pointer; padding:0; text-decoration:underline;">{{ t.users_delete }}</button>
+            </form>
+        </td>
+    </tr>
+    {% endfor %}
+</table>
+{% endblock content %}