Add support for non-software projects by making the platform more generic

[Oluwatos94]

Add support for non-software projects by making the platform more generic. Projects can now be registered as
either SOFTWARE (Git-based) or GENERIC (IPFS-only) types.

Changes

Data Model

• Added ProjectType enum (SOFTWARE | GENERIC) to projectConfig.ts
• Renamed authorGithubNames → authorHandles for generic terminology
• Made githubLink optional and added readmeContent field
• Added backward compatibility (defaults to SOFTWARE for existing projects)

Registration Flow

• Added project type selection in CreateProjectModal.tsx
• Made GitHub repository URL conditional (SOFTWARE only)
• Added README textarea for GENERIC projects
• Updated TOML generation to include PROJECT_TYPE
• Modified FlowService.ts to handle README file uploads

Display & Services

• Updated ReadmeViewer.tsx to fetch from either GitHub or IPFS based on project type
• Made Git-specific components conditional in ProjectInfo.astro
• Added null checks in GithubService.ts for optional Git URLs
• Updated all references from authorGithubNames to authorHandles across the codebase

Testing

✅ Verified UI changes:

• Project type selection working
• Generic "Handle" label displaying correctly
• Form validation for both project types

⚠️ Could not test full IPFS upload flow for GENERIC projects due to Storacha delegation errors from the deployed
testnet worker (https://ipfs-testnet.tansu.dev). The error "failed space/blob/add invocation" indicates
infrastructure-side credential issues that need to be resolved separately.

Related

Closes #330

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