feat(M5): Plugin-MiniApps — dms, mail, wiki, graph_rag, automation (#363)

- 5 Manifest-Beiträge (MiniAppContribution): dms_folders (dms:read), mail_unread (mail:read), wiki_recent (wiki:read), graph_overview (graph:read), automation_status (automation:read) — je settings_schema max_items, order 60-100
- 5 Frontend-Widgets auf bestehenden API-Clients (keine neuen Backend-Endpoints): DmsFoldersWidget, MailUnreadWidget, WikiRecentWidget, GraphOverviewWidget, AutomationStatusWidget
- MiniAppHost-Registry +5; tsc clean, build OK
- Tests: M5 7/7 (TDD rot->gruen), Backend-Regression 53/53, Vitest 22/22

app/plugins/builtins/wiki/plugin.py

@@ -4,7 +4,13 @@ from __future__ import annotations
 import logging
 
 from app.plugins.base import BasePlugin
-from app.plugins.manifest import FrontendMenuItem, FrontendPageRoute, PluginManifest, PluginRouteDef
+from app.plugins.manifest import (
+    FrontendMenuItem,
+    FrontendPageRoute,
+    MiniAppContribution,
+    PluginManifest,
+    PluginRouteDef,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -19,6 +25,25 @@ class WikiPlugin(BasePlugin):
         routes=[
             PluginRouteDef(path="/api/v1/wiki", module="app.plugins.builtins.wiki.routes", router_attr="router"),
         ],
+        miniapps=[
+            MiniAppContribution(
+                app_id="wiki_recent",
+                name="Wiki-Neuigkeiten",
+                icon="BookOpen",
+                description="Zuletzt aktualisierte Wiki-Artikel.",
+                permission="wiki:read",
+                settings_schema={
+                    "fields": [
+                        {"name": "max_items", "label": "Max. Artikel", "type": "number", "default": 5},
+                    ]
+                },
+                col_span=2,
+                row_span=1,
+                hosts=["chat", "dashboard", "window"],
+                component="@/components/dashboard/WikiRecentWidget",
+                order=80,
+            ),
+        ],
         permissions=["wiki:read", "wiki:write", "wiki:delete", "wiki:admin"],
         menu_items=[FrontendMenuItem(label_key="wiki.menu.wiki", label="Wiki", path="/wiki", icon="BookOpen", permission="wiki:read")],
         page_routes=[FrontendPageRoute(path="/wiki", component="@/pages/Wiki", permission="wiki:read")],