Fixes
https://linear.app/chatwoot/issue/CW-6415/sending-large-attachments-11mb-via-telegram-channels-fails-with-http
#### Issue
Sending large attachments (~11MB) via Telegram channels fails with HTTP
502 (Bad Gateway) and 413 (Request Entity Too Large) errors. The issue
is caused by HTTParty's built-in multipart encoding, which reads the
entire file into an in-memory string before constructing the request
body. For large files, this produces a malformed multipart request that
Telegram's API proxy rejects.
#### Solution
Replace HTTParty with Faraday + multipart-post (both already available
in the project) for the sendDocument multipart upload. The
multipart-post gem streams file content directly from disk into the HTTP
request, producing a correctly formed multipart body that Telegram
accepts for large files.
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Co-authored-by: Sojan Jose <sojan@pepalo.com>
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