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feat(bb_ota_pull): chunk firmware download via HTTP Range (partial_http_download) (#313)

Without partial_http_download, the server can send TLS records up to 16
KB. With CONFIG_MBEDTLS_DYNAMIC_BUFFER on, mbedtls dynamically allocates
its IN buffer to fit the negotiated max record — that's the ~17 KB
`Dynamic Impl: alloc(16749 bytes) failed` failure observed on tdongle-s3
and esp32-wroom32 (no-PSRAM boards) once internal heap fragments.

Enable esp_https_ota's partial_http_download with max_http_request_size
= 4 KB. Each chunk arrives in TLS records ~5 KB. Consumers can now
compile-time lower CONFIG_MBEDTLS_SSL_IN_CONTENT_LEN to 8 KB, dropping
the peak mbedtls allocation from ~17 KB to ~9 KB. Bulletproofs OTA pull
on no-PSRAM boards regardless of uptime.

Requires keep_alive_enable = true on the http config so Range requests
reuse the same TLS connection.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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