Expand Prisma seed data and update setup docs

[MonzaTech]

Summary

• expand the Prisma seed to populate six actors, problems, and solutions across focus areas with realistic evidence and relationship links
• update the setup instructions to run the new npm seed script and review data in Prisma Studio

Testing

• not run (not requested)

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https://chatgpt.com/codex/tasks/task_e_68e922a8aa188332ab3d71462e971ebf

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid querying non-existent Solution.country field

The solutions API constructs Prisma filters using country (for both keyword search and explicit country filters), but the Solution model in schema.prisma has no country column. When a client supplies a search term or country filter, Prisma will throw Unknown field "country" for model Solution and the endpoint returns 500 instead of results. Either add the missing country attribute to the model or remove these filters; otherwise solution search is unusable whenever those parameters are present.

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