Support large files in filecoin-pin

[BigLep]

Done Criteria

filecoin-pin takes advantage of the functionality implemented in FilOzone/synapse-sdk#110 (when it's ready)

Documentation is also updated. Known spots to update:

• docs: add glossary, add explainer, and content routing FAQ #233 (comment)
• docs: add glossary, add explainer, and content routing FAQ #233 (comment)
• docs: add glossary, add explainer, and content routing FAQ #233 (comment)

Why Important

Larger file support is a common feedback ittem we've received.

Notes

[BigLep]

During 2025-11-06 FS WG sync it was agreed that we don't need to get this in for M3.5. There is concern about destabilizing our launch. This can be a fast follow, thus I've moved it to the MX milestone.

[rvagg]

We should be able to support 1GiB uploads with Filecoin Pin without changes. FilOzone/synapse-sdk#110 was repurposed to be a "larger than 1GiB" issue since we solved for 1GiB.

@SgtPooki is there anything blocking 1GiB if that's the size Synapse exports as its maximum? https://github.com/FilOzone/synapse-sdk/blob/734a59f6f0e8558b8272bc20216e5a30e91f62a6/packages/synapse-core/src/piece.ts#L31