Applications: show related knowledge-base articles on the app detail

Classic ShopDB listed an application's related KB articles on its page; the flask
app detail didn't, even though KB articles carry an appid FK. get_application now
returns a knowledgebase list (KB rows linked by appid; lazy + plugin-guarded so
core stays decoupled), and ApplicationDetail.vue renders a Knowledge Base section
linking each article.

Verified: an app returns its linked KB (e.g. 77 articles) and the section renders.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

shopdb/core/api/applications.py

@@ -40,6 +40,19 @@ def _installed_count(appid):
     return ComputerInstalledApp.query.filter_by(appid=appid, isactive=True).count()
 
 
+def _related_kb(appid):
+    """Knowledge Base articles linked to this app, [] when the KB plugin is
+    absent. Lazy + guarded so core stays decoupled from the plugin."""
+    try:
+        from plugins.knowledgebase.models import KnowledgeBase
+    except ImportError:
+        return []
+    rows = KnowledgeBase.query.filter_by(appid=appid, isactive=True).order_by(
+        KnowledgeBase.shortdescription).all()
+    return [{'linkid': k.linkid, 'shortdescription': k.shortdescription,
+             'linkurl': k.linkurl, 'keywords': k.keywords} for k in rows]
+
+
 def _require_computer_models():
     """Resolve (Computer, ComputerInstalledApp) or a 503 response tuple.
 
@@ -116,6 +129,7 @@ def get_application(app_id: int):
     data = app.to_dict()
     data['versions'] = [v.to_dict() for v in app.versions.filter_by(isactive=True).order_by(AppVersion.version.desc()).all()]
     data['installedcount'] = _installed_count(app.appid)
+    data['knowledgebase'] = _related_kb(app.appid)
 
     return success_response(data)