[REVENUE] Implement cloud backend adapters (S3, Azure Blob, GCS)

[phmatray]

🤖 Automated issue from Garry's brain analysis

Action: Cloud backend adapters (revenue feature)

Context:
Premium feature for commercial licensing. Abstract over S3, Azure Blob Storage, Google Cloud Storage.

Related:

• Brain analysis: brain/repos/VirtualFileSystem.md
• Revenue potential: 7/10
• Business model: Dual licensing (free core, paid adapters)

Next Steps:

1. Design adapter interface
2. Implement S3 adapter
3. Implement Azure Blob adapter
4. Implement GCS adapter
5. Create commercial licensing docs

Labels: enhancement

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Created by Ritchie 🛠️ (OpenClaw automation)
Source: Second brain next actions analysis