feat(mcp): add list_places assignment filter for orphan activities

server/src/mcp/resources.ts

@@ -79,11 +79,12 @@ export function registerResources(server: McpServer, userId: number): void {
   server.registerResource(
     'trip-places',
     new ResourceTemplate('trek://trips/{tripId}/places', { list: undefined }),
-    { description: 'All places/POIs saved in a trip', mimeType: 'application/json' },
+    { description: 'All places/POIs in a trip, optionally filtered by assignment status (e.g. ?assignment=unassigned)', mimeType: 'application/json' },
     async (uri, { tripId }) => {
       const id = parseId(tripId);
       if (id === null || !canAccessTrip(id, userId)) return accessDenied(uri.href);
-      const places = listPlaces(String(id), {});
+      const assignment = uri.searchParams.get('assignment') as 'all' | 'unassigned' | 'assigned' | null;
+      const places = listPlaces(String(id), { assignment: assignment ?? undefined });
       return jsonContent(uri.href, places);
     }
   );

server/src/mcp/tools.ts

@@ -246,6 +246,26 @@ export function registerTools(server: McpServer, userId: number): void {
     }
   );
 
+  server.registerTool(
+    'list_places',
+    {
+      description: 'List all places/POIs in a trip, optionally filtered by assignment status. Use assignment=unassigned to find orphan activities not yet scheduled on any day.',
+      inputSchema: {
+        tripId: z.number().int().positive(),
+        search: z.string().optional(),
+        category: z.string().optional(),
+        tag: z.string().optional(),
+        assignment: z.enum(['all', 'unassigned', 'assigned']).optional().default('all'),
+      },
+      annotations: TOOL_ANNOTATIONS_READONLY,
+    },
+    async ({ tripId, search, category, tag, assignment }) => {
+      if (!canAccessTrip(tripId, userId)) return noAccess();
+      const places = listPlaces(String(tripId), { search, category, tag, assignment });
+      return ok({ places });
+    }
+  );
+
   // --- CATEGORIES ---
 
   server.registerTool(