docs(web): expand storage module page

[kkopanidis]

Summary

• Expand the storage module docs with provider-specific configuration for AWS S3, Azure Blob Storage, and Google Cloud Storage
• Document signed URL lifecycle (60 min expiry), public vs private access at file and container levels, folder marker objects, CDN mapping, and Prometheus metrics

Test plan

• Verify MDX renders on the docs site without component errors
• Confirm provider config tables match modules/storage/src/config/config.ts
• Confirm metrics names match modules/storage/src/metrics/index.ts

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[kkopanidis]

Content review fixes applied (factual alignment with Conduit source). Recommended merge order: #138 → #134 → #135 → #139 → #140 → #141 → #136 → #137 → #142.