chore(deps): update express to 5.2.1

[deniswsrosa]

Summary

• Updates direct npm dependency express from ^4.22.2 to ^5.2.1 and regenerates package-lock.json with the existing npm lockfile v2 format.
• Applies the minimal Express 5 compatibility fix for the catch-all 404 handler (app.get('*', ...) -> app.use(...)).
• Leaves Babel packages on 7.29.7 because Babel 8 requires Node ^22.18.0 || >=24.11.0, while this repository's CI and Dockerfile target Node 20.

Updated dependencies

Ecosystem	Dependency	Previous	Updated	Type	Notes
npm	express	^4.22.2	^5.2.1	direct production dependency	Requires minimal catch-all route compatibility fix under Express 5/path-to-regexp.

Validation

Commands run locally:

npm install --lockfile-version=2
npm outdated --json --depth=0
npm ls --depth=0
npm run build
DB_CONN_STR=couchbase://127.0.0.1 DB_USERNAME=Administrator DB_PASSWORD=password DB_BUCKET_NAME=travel-sample APP_PORT=3000 npm run testGA
npm test
# Node 20 CI compatibility check in dockerized copy:
docker run --rm -v /home/ubuntu/.hermes/kanban/workspaces/t_c9eb6d34/node20-copy:/app -w /app node:20 npm ci
docker run --rm -v /home/ubuntu/.hermes/kanban/workspaces/t_c9eb6d34/node20-copy:/app -w /app node:20 npm run build
npm start
curl -i -L http://127.0.0.1:3000/
curl -i http://127.0.0.1:3000/swagger-ui/

Gate	Result	Evidence
Install / lockfile regeneration	Passed	npm install --lockfile-version=2; lockfile remains version 2.
Direct dependency inventory	Passed	npm ls --depth=0 shows express@5.2.1; Babel packages remain 7.29.7 due Node 20 constraint.
Build	Passed	npm run build compiled 10 files with Babel.
Integration tests	Passed	npm run testGA: 19/19 test suites passed against local Couchbase travel-sample.
Config-file test path	Passed	npm test: 19/19 test suites passed via config/test.env.
Node 20 CI compatibility	Passed	Docker node:20 ran npm ci and npm run build successfully.
Browser / Swagger evidence	Passed	Local app served /swagger-ui/ with Swagger UI title and OpenAPI endpoint listing.

Risk notes

• Existing Dependabot PRs are open for Express/transitive dependency updates. This PR is the locally validated Express 5 update from the dependency-update preflight and includes the required Express 5 route compatibility fix.
• Babel 8 was intentionally not included because it is incompatible with the repository's Node 20 CI/runtime target.
• No generated dist, node_modules, environment files, Couchbase logs, or evidence artifacts are committed.

Rollback

Revert this PR to restore express to ^4.22.2, the previous lockfile graph, and the prior catch-all route declaration.

[gemini-code-assist]

Code Review

This pull request upgrades the express dependency from version 4.x to 5.x, updating its corresponding sub-dependencies in package-lock.json. Additionally, in src/app.js, the wildcard route handler has been changed from app.get('*', ...) to a catch-all middleware app.use(...) to handle 404 errors for all HTTP methods instead of just GET requests. There are no review comments, and I have no feedback to provide.

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