fix(qa): bump repo-relative path in the newly-merged declarative-mcp dogfood test + regen lockfile after merge

showcase-declarative-mcp.dogfood.test.ts landed on main (#3062) against
the old packages/dogfood location; after the packages/qa migration its
'../../../examples/app-showcase' URL resolved inside packages/. One more
level, same as the other conformance tests. Lockfile regenerated after
taking main's side in the merge.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A1BtxNeUaGmvUYr8FwtUNu

Author: claude

packages/qa/dogfood/test/showcase-declarative-mcp.dogfood.test.ts

@@ -23,7 +23,7 @@ import { ConnectorMcpPlugin } from '@objectstack/connector-mcp';
 import { ConnectorOpenApiPlugin } from '@objectstack/connector-openapi';
 import { ConnectorRestPlugin } from '@objectstack/connector-rest';
 
-const SHOWCASE_DIR = fileURLToPath(new URL('../../../examples/app-showcase/', import.meta.url));
+const SHOWCASE_DIR = fileURLToPath(new URL('../../../../examples/app-showcase/', import.meta.url));
 
 interface ConnectorDescriptor {
     name: string;