build(deps): bump the ai-sdk group with 2 updates (#4184)

Bumps the ai-sdk group with 2 updates: [@ai-sdk/mcp](https://github.com/vercel/ai) and [ai](https://github.com/vercel/ai).


Updates `@ai-sdk/mcp` from 1.0.18 to 1.0.19
- [Release notes](https://github.com/vercel/ai/releases)
- [Changelog](https://github.com/vercel/ai/blob/main/CHANGELOG.md)
- [Commits](https://github.com/vercel/ai/compare/@ai-sdk/mcp@1.0.18...@ai-sdk/mcp@1.0.19)

Updates `ai` from 6.0.73 to 6.0.78
- [Release notes](https://github.com/vercel/ai/releases)
- [Changelog](https://github.com/vercel/ai/blob/main/CHANGELOG.md)
- [Commits](https://github.com/vercel/ai/compare/ai@6.0.73...ai@6.0.78)

---
updated-dependencies:
- dependency-name: "@ai-sdk/mcp"
  dependency-version: 1.0.19
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ai-sdk
- dependency-name: ai
  dependency-version: 6.0.78
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ai-sdk
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

packages/backend/package.json

@@ -110,11 +110,11 @@
     "typecheck": "pnpm run generate && tsc --noEmit"
   },
   "dependencies": {
-    "@ai-sdk/mcp": "^1.0.18",
+    "@ai-sdk/mcp": "^1.0.19",
     "@ai-sdk/openai-compatible": "^2.0.27",
     "@huggingface/gguf": "^0.3.3",
     "@huggingface/hub": "^2.8.1",
-    "ai": "^6.0.73",
+    "ai": "^6.0.78",
     "express": "^5.2.1",
     "express-openapi-validator": "^5.6.2",
     "isomorphic-git": "^1.36.3",