Generate typescript client from fastapi openapi.json

[lkeegan]

• add export.py script to backend to generate openapi.json
• add generated openapi.json file
• add autogenerated typescript fetch api client in src/lib/client using hey-api/openapi-ts
• add hey-api/openapi-ts and hey-api/client-fetch to frontend deps
• add openapi-ts to package.json scripts
• add openapi-ts config file
• run pnpm openapi-ts
• automatically export openapi.json and generate openapi-ts client code in CI

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0.19763% with 1010 lines in your changes missing coverage. Please review.

Project coverage is 14.98%. Comparing base (2c27e50) to head (7692cd7).

Files with missing lines	Patch %	Lines
frontend/src/lib/client/schemas.gen.ts	0.14%	705 Missing :warning:
frontend/src/lib/client/services.gen.ts	0.00%	278 Missing and 1 partial :warning:
mondey_backend/src/mondey_backend/export.py	0.00%	13 Missing :warning:
frontend/openapi-ts.config.ts	0.00%	8 Missing and 1 partial :warning:
frontend/src/lib/client/index.ts	0.00%	3 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #96 +/- ## ========================================== - Coverage 19.43% 14.98% -4.45% ========================================== Files 75 81 +6 Lines 3371 4383 +1012 Branches 106 111 +5 ========================================== + Hits 655 657 +2 - Misses 2663 3670 +1007 - Partials 53 56 +3 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
44 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud