feat: tools and limits settings tabs

Adds Einstellungen → LIT MCP → Tools (direct/indirect/disabled per
ability, only ExposurePolicy-allowed modes offered) and → Limits
(upload size, log retention, snapshot count), wired into Plugin.php.

Ruling Q11b (carried from task 6): overview.md notes that direct
visibility is configurable; hints in src/ that name a tool which is
direct by default but can be switched to indirect (content-get,
content-query, content-types, post-publish, media-search) now use the
neutral "lit/<name> (direkt: lit-<name>)" form so they stay correct
after an admin override. lit/guide (always direct) and the
media-preview/-download DIRECT_ONLY tools are unaffected.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

src/Plugin.php

@@ -11,8 +11,10 @@ use LIT\MCP\Admin\AdminNotices;
 use LIT\MCP\Admin\ConnectionRepository;
 use LIT\MCP\Admin\ConnectionStatus;
 use LIT\MCP\Admin\ConnectionTab;
+use LIT\MCP\Admin\LimitsTab;
 use LIT\MCP\Admin\SettingsPage;
 use LIT\MCP\Admin\SiteHealth;
+use LIT\MCP\Admin\ToolsTab;
 use LIT\MCP\ChangeLog\ChangeLog;
 use LIT\MCP\ChangeLog\ChangeLogCleanup;
 use LIT\MCP\ChangeLog\ChangeLogInstaller;
@@ -82,6 +84,8 @@ final class Plugin
         self::$settingsPage = new SettingsPage([
             new ConnectionTab($status),
             new AccessTab($access, new ConnectionRepository()),
+            new ToolsTab($registry, $policy),
+            new LimitsTab(),
         ]);
         if (is_admin()) {
             self::$settingsPage->register();