Adds admin permissions management page

Implements an admin permissions management page.

This change allows superusers to manage permissions directly from the castle interface, providing a more streamlined experience for administrative tasks.

templates/castle/index.html

@@ -16,10 +16,13 @@
             <h5 class="q-my-none">🏰 Castle Accounting</h5>
             <p class="q-mb-none">Track expenses, receivables, and balances for the collective</p>
           </div>
-          <div class="col-auto">
+          <div class="col-auto q-gutter-xs">
             <q-btn v-if="!isSuperUser" flat round icon="account_balance_wallet" @click="showUserWalletDialog">
               <q-tooltip>Configure Your Wallet</q-tooltip>
             </q-btn>
+            <q-btn v-if="isSuperUser" flat round icon="admin_panel_settings" :href="'/castle/permissions'">
+              <q-tooltip>Manage Permissions (Admin)</q-tooltip>
+            </q-btn>
             <q-btn v-if="isSuperUser" flat round icon="settings" @click="showSettingsDialog">
               <q-tooltip>Castle Settings (Super User Only)</q-tooltip>
             </q-btn>

views.py

@@ -17,3 +17,17 @@ async def index(
     return template_renderer(["castle/templates"]).TemplateResponse(
         request, "castle/index.html", {"user": user.json()}
     )
+
+
+@castle_generic_router.get(
+    "/permissions",
+    description="Permission management page",
+    response_class=HTMLResponse,
+)
+async def permissions(
+    request: Request,
+    user: User = Depends(check_user_exists),
+):
+    return template_renderer(["castle/templates"]).TemplateResponse(
+        request, "castle/permissions.html", {"user": user.json()}
+    )