refactor: simplify data-layer architecture

[pettinarip]

Summary

• Simplifies data-layer from 12+ files to 3 core files (index.ts, storage.ts, tasks.ts)
• Renames api/ directory to fetchers/ for clarity
• Uses KEYS object as single source of truth for task IDs
• Removes redundant registry pattern and complex storage abstractions
• Updates trigger.dev config to use built-in --env-file flag

Test plan

• Verify data fetching works in dev mode with mock data
• Verify data fetching works in production with Netlify Blobs
• Run type check: pnpm tsc --noEmit

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Lighthouse	7 paths audited Performance: 56 (🟢 up 3 from production) Accessibility: 94 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 59 (no change from production) View the detailed breakdown and full score reports

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[wackerow]

Thanks @pettinarip!