feat: support concurrent chunk uploads

[TorstenDittmann]

This PR updates the SDK to support concurrent chunk uploads.

[greptile-apps]

Greptile Summary

This PR replaces the sequential chunk-upload loop with a concurrent implementation that uploads the first chunk alone (to obtain the server-assigned upload ID), then dispatches all remaining chunks with up to 8 parallel requests using a fill-the-pipeline queue. The version is bumped to 13.1.0 and the response-format header is updated to 1.9.5.

• The rejected flag correctly short-circuits new chunk dispatch and suppresses onProgress callbacks after any chunk fails, and finalResponse ?? lastResponse provides the return-value fallback for the completed upload.
• ping()'s return type is widened to Promise<unknown>, which is a TypeScript-breaking change for SDK consumers that previously used the result as a string.
• totalChunks === 1 (line 1003) is dead code because the file.size <= Client.CHUNK_SIZE early return on line 977 always fires first for single-chunk files.

Confidence Score: 4/5

The concurrent upload logic is sound and the rejected flag properly gates new dispatch after failure. The only concern is a TypeScript API surface change on ping() that could break typed call sites.

The concurrent upload implementation is correct: the first-chunk gate, x-appwrite-id propagation, byte-range arithmetic, and the rejected-flag guard all look right. The ping() return-type change from string to unknown is a breaking TypeScript API change that could require consumer-side fixes.

src/client.ts — the ping() return type change and the dead totalChunks === 1 branch.

Important Files Changed

Filename	Overview
src/client.ts	Rewrites chunked upload to support up to 8 concurrent chunk requests; uploads first chunk sequentially to obtain the upload ID, then dispatches remaining chunks concurrently with a rejected flag to stop dispatch after failure. The ping() return type is widened from Promise<string> to Promise<unknown>.
package.json	Version bump 13.0.0 → 13.1.0 and response-format header updated to 1.9.5.
package-lock.json	Lock file updated to reflect the version bump to 13.1.0; no dependency changes.

_{Reviews (4): Last reviewed commit: "feat: support concurrent chunk uploads" | Re-trigger Greptile}