Support Storacha (Web3.Storage) as a Storage Provider

[SigmaEnterprise]

Pre-submission Checklist

• [x] I have searched the existing issues and this feature has not been requested yet

Type of Feature

API / Backend

Problem or Use Case

I would like to propose adding Storacha (the evolution of Web3.Storage) as a supported storage backend for Memos. Storacha is a decentralized "hot" storage network built on Filecoin and IPFS that allows for permanent, content-addressed storage of media and assets.

Proposed Solution

• Add Storacha to the Storage Settings: Provide a new storage option in the admin panel alongside Local, S3, and Database.
• UCAN Integration: Implement authentication using Storacha’s UCAN-based authorization (no static API keys; use delegated proofs for better security).
• CID-Based Asset Linking: Assets uploaded via Memos should return their unique IPFS CID (Content Identifier) for the database reference, ensuring data integrity.
• Public Gateway Support: Enable configurable gateway URLs (e.g., w3s.link or storacha.link) for easy asset retrieval in memos.

While Cloudflare R2/S3 are excellent high-performance cloud solutions, adding Storacha aligns with the "Privacy-First" and "Self-Hosted" philosophy of Memos in three specific ways:

1. Data Sovereignty: Unlike traditional cloud providers, Storacha provides verifiable, user-owned data. Assets are stored on a decentralized network rather than a single entity’s infrastructure.
2. Permanent Content Addressing: By using CIDs instead of location-based URLs, Memos assets become immutable and portable. If the storage provider service changes, the data remains discoverable on the global IPFS network.
3. No Vendor Lock-in: Storacha is built on open standards (IPFS/Filecoin). This provides an "exit strategy" from the centralized web, ensuring that user memos and their attached media can exist independently of any one corporation.

Storacha provides a mature JS Client and Go SDK, making it straightforward to integrate into the existing Memos architecture.

• Documentation: https://docs.storacha.network/
• Authorization: UCAN (User Controlled Authorization Networks)

Alternatives Considered

No response

Additional Context

No response