Add high-speed binary file upload to Notehub

[Bucknalla]

Summary

• Add notecard/upload.py with chunked binary upload that stages data through the Notecard's binary buffer (card.binary.put) and sends to Notehub via web.post with binary:true
• Add retry logic for both binary staging (up to 50 attempts) and web.post HTTP errors (up to 20 attempts with 15s delay, re-staging binary data before each retry)
• Add progress callback support with per-chunk stats (bytes/sec, ETA, percent complete)
• Add missing label parameter to web.post() and web.put() fluent API helpers

Test plan

• 22 new unit tests covering validation, single/multi-chunk uploads, binary staging retries, web.post retries, and progress callbacks
• All 415 existing tests pass with no regressions
• Manual verification with a real Notecard uploading a binary file to a configured proxy route

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