fix(prisma): store classroom certifications as string arrays

[CarlyAThomas]

Co-authored-by: Newton Chung <NewtonLC@users.noreply.github.com>

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Summary

• Fixes Prisma runtime error caused by schema/data mismatch on classroom certifications.
• Updates classroom certifications in Prisma schema from integer array to string array.
• Re-baselines migrations into a single initial migration (dev-only cleanup).

Problem
Prisma was attempting to read fccCertifications as Int[], but existing rows contain dashed-name strings (for example, full-stack-developer-v9).
This caused prisma.classroom.findMany() to fail with an inconsistent column data conversion error.

Changes

• Changed Classroom.fccCertifications type in Prisma schema from Int[] to String[].
• Recreated migrations as a single fresh initial migration based on the current schema.
• Regenerated Prisma client and applied migration locally.

Validation

• npx prisma validate passes.
• npx prisma generate passes.
• npx prisma migrate status shows schema up to date.
• Direct Prisma read query for classrooms succeeds and returns string-array certifications.
• Existing test suite run completed successfully.

Notes

• This is intended for development-stage migration cleanup.

• Local DB was reset during migration re-baselining.

• This PR is needed in order for prisma to handle the new curriculum changes.

[NewtonLC]

Since the codebase is still attempting to use https://www.freecodecamp.org/curriculum-data/v1... which is deprecated, it's hard to test these changes alone.

I was able to test the code in a different branch(CarlyAThomas:feat/v2-tiered-requirements), created a classroom, and got the intended result. fccCertifications in prisma should use strings:

[NewtonLC]

Code in api_proccesor.js, [id].js, and [studentEmail].js need to be updated accordingly. Mentions of fccCertifications still assumes that it's a list of indices.