feat(npcs): add groups, storyline bindings, and Foundry import

Nested NPC groups with color, graph filter, and scene/storyline binding; Foundry worlds/modules import actors into groups; storyline merge asks on NPC name conflicts and reports NPC counts.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/shared/foundry/foundryPaths.ts

@@ -0,0 +1,11 @@
+/** Декодирует %20 и т.п. в путях Foundry; безопасен для уже декодированных строк. */
+export function decodeFoundryAssetPath(foundryPath: string): string {
+  const trimmed = foundryPath.trim().replace(/\\/gu, '/').replace(/^\/+/u, '');
+  if (!trimmed) return '';
+  if (/^https?:\/\//iu.test(trimmed)) return trimmed;
+  try {
+    return decodeURIComponent(trimmed);
+  } catch {
+    return trimmed;
+  }
+}