feat: Implement background job queue for async story generation

[ccraig09]

Goal

Decouple story generation from the HTTP request-response cycle using background jobs.

Context

Story generation takes 5-10 seconds. Vercel functions have timeouts, which can cause issues for longer generations.

Tasks

• Evaluate Inngest vs QStash for background job processing
• Implement async story generation queue
• Add status polling or websocket for real-time updates
• Update UI to show generation progress

References

• ROADMAP.md: Section 3 - AI Service Scalability

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