Fix: Update poidh app profile: strengthen protocol mechanics, use

[joebkarwalo]

What

Updates the poidh app profile (src/content/apps/poidh.md) with:

• A more detailed explanation of the protocol's core mechanics (bounty creation, claim submission, voting/acceptance, fund release)
• Expanded, concrete use cases beyond the general "pics or it didn't happen" pitch
• Multi-chain deployment details (Base, Degen, Arbitrum) and how bounty/claim data is scoped per chain

Why

The existing poidh profile was thin on protocol mechanics and didn't reflect the app's multi-chain deployment, which is a key differentiator. This update brings the content in line with other detailed app profiles in the directory and gives readers a clearer picture of how poidh actually works and where it's live.

Testing

• Verified frontmatter matches the App/BaseContent type in src/lib/types.ts (no new fields required, all existing markdown parsing in src/lib/markdown.ts supports these fields)
• Confirmed the file parses via getAppFromMarkdown('poidh') / getAllApps() used in src/content/apps.ts
• Ran npm run build locally to confirm the app detail page renders without type errors
• Checked tags array renders correctly in AppCard and search API (src/app/api/search/route.ts)

Closes #406

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