build(deps): bump express and @types/express

Bumps [express](https://github.com/expressjs/express) and [@types/express](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/express). These dependencies needed to be updated together.

Updates `express` from 4.21.2 to 5.1.0
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.21.2...v5.1.0)

Updates `@types/express` from 4.17.21 to 5.0.1
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/express)

---
updated-dependencies:
- dependency-name: express
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/express"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/backend/package.json

@@ -104,7 +104,7 @@
     "@huggingface/gguf": "^0.1.14",
     "@huggingface/hub": "^1.1.2",
     "ai": "^4.3.10",
-    "express": "^4.21.2",
+    "express": "^5.1.0",
     "express-openapi-validator": "^5.4.9",
     "isomorphic-git": "^1.30.1",
     "js-yaml": "^4.1.0",
@@ -122,7 +122,7 @@
     "@podman-desktop/api": "1.13.0-202409181313-78725a6565",
     "@ai-sdk/provider-utils": "^2.2.6",
     "@rollup/plugin-replace": "^6.0.2",
-    "@types/express": "^4.17.21",
+    "@types/express": "^5.0.1",
     "@types/js-yaml": "^4.0.9",
     "@types/mustache": "^4.2.5",
     "@types/node": "^22",