feat(geschichten): wire discovery integrations on Person and Document pages

Person detail (/persons/[id]):
- Server load fetches GET /api/geschichten?status=PUBLISHED&personId={id}
  in parallel with the existing person/document queries.
- Renders <GeschichtenCard> below the received-documents list when the
  person has at least one published story.

Document detail (/documents/[id]):
- Server load adds the same parallel call with documentId={id}.
- DocumentTopBar gains geschichten + canBlogWrite props that flow through
  to DocumentMetadataDrawer.
- DocumentMetadataDrawer's grid expands to lg:grid-cols-4 when the
  Geschichten column should appear (stories exist OR user can author),
  and shows "+ Geschichte anhängen" / "Alle anzeigen" links following the
  >= 3-story threshold from issue comment #5758.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/routes/persons/[id]/+page.server.ts

@@ -17,14 +17,18 @@ export async function load({ params, fetch, locals }) {
 		receivedDocsResult,
 		aliasesResult,
 		relsResult,
-		inferredResult
+		inferredResult,
+		geschichtenResult
 	] = await Promise.all([
 		api.GET('/api/persons/{id}', { params: { path: { id } } }),
 		api.GET('/api/persons/{id}/documents', { params: { path: { id } } }),
 		api.GET('/api/persons/{id}/received-documents', { params: { path: { id } } }),
 		api.GET('/api/persons/{id}/aliases', { params: { path: { id } } }),
 		api.GET('/api/persons/{id}/relationships', { params: { path: { id } } }),
-		api.GET('/api/persons/{id}/inferred-relationships', { params: { path: { id } } })
+		api.GET('/api/persons/{id}/inferred-relationships', { params: { path: { id } } }),
+		api.GET('/api/geschichten', {
+			params: { query: { status: 'PUBLISHED', personId: id } }
+		})
 	]);
 
 	if (!personResult.response.ok) {
@@ -39,6 +43,7 @@ export async function load({ params, fetch, locals }) {
 		aliases: aliasesResult.data ?? [],
 		relationships: relsResult.data ?? [],
 		inferredRelationships: inferredResult.data ?? [],
+		geschichten: geschichtenResult.data ?? [],
 		canWrite
 	};
 }