feat: add timestamp header helper for public creator responses

[johnsmccain]

Summary

Adds a small utility for attaching X-Response-Timestamp headers to public creator-facing responses, and fixes the Prisma multi-file schema client generation that was blocking the build.

Changes

src/utils/timestamp-headers.utils.ts (new)

Centralizes timestamp header logic in one place:

• RESPONSE_TIMESTAMP_HEADER — the header name constant
• formatTimestampHeader(date?) — pure formatter, returns ISO 8601 string
• attachTimestampHeader(res, date?) — sets the header on an Express response

src/modules/creators/creators.controllers.ts

Calls attachTimestampHeader(res) before sendSuccess in both httpListCreators and httpGetCreatorStats.

src/modules/creator/creator.controller.ts

Calls attachTimestampHeader(res) before sendSuccess in listCreators.

prisma/schema/schema.prisma

Added previewFeatures = ["prismaSchemaFolder"] to the generator block so prisma generate picks up all model files (user.prisma, creator.prisma, wallet.prisma) when pointed at the schema directory. Without this the generated client was missing all models and the build failed.

How to test

pnpm prisma generate --schema=prisma/schema
pnpm run build

Any public creator list or stats response will now include an X-Response-Timestamp header with the current UTC time in ISO 8601 format.

Commits

• 826af55 feat: add timestamp header helper for public creator responses
• 6ea35d1 fix: enable prismaSchemaFolder to include all model files in client generation

Close #77

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[Chucks1093]

@johnsmccain fix merge conflicts

[johnsmccain]

Done

[Chucks1093]

@johnsmccain fix merge conflict and send link to the group. Check issue description for link