feat(scenario): export scenarios as standalone playwright e2e test projects

- Added E2eExportService to package scenarios as plug-and-play zip archives
  containing package.json, playwright.config.ts, test.spec.ts, .env, credentials.json,
  snippets, and referenced scenario files
- Only bundles credentials, snippets, and files actually referenced (directly or
  transitively) by the scenario's steps, reducing archive size
- Exported test runs entirely offline using a context shim that mirrors liqa's API
  (page, getCredential, runSnippet, getScenarioFiles, downloadFile, assert, etc.)
- Added GET /scenarios/:id/export-e2e HTTP endpoint and export_e2e_test MCP tool
- Added getUsedSnippets() endpoint to list snippets referenced by a scenario
- Added "Used Snippets" section on scenario detail page
- Added archiver@^7.0.1 dependency for zip archive creation
- Bumped version to 1.11.0

server/package.json

@@ -29,6 +29,7 @@
     "@nestjs/typeorm": "^11.0.1",
     "@playwright/test": "^1.59.1",
     "acorn": "^8.16.0",
+    "archiver": "^7.0.1",
     "better-sqlite3": "^12.8.0",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.14.4",
@@ -46,6 +47,7 @@
     "@nestjs/cli": "^11.0.17",
     "@nestjs/testing": "^11.1.18",
     "@types/acorn": "^4.0.6",
+    "@types/archiver": "^6.0.4",
     "@types/better-sqlite3": "^7.6.13",
     "@types/debug": "^4.1.13",
     "@types/express": "^5.0.6",