Add Supabase FAQ and status schema

[fabcrowd]

Summary

• add SQL migration that creates FAQ, tag, source, and status metric tables with supporting indexes
• seed FAQ content, tag relations, sources, and status metrics from existing JSON
• document how to apply the schema and maintain status metrics via Supabase CLI or SQL

Testing

• not run

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https://chatgpt.com/codex/tasks/task_e_68e26fe90ecc833085deae9e57b7395a

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