chore: downgrade verbose per-packet log messages from DEBUG to TRACE

[lklimek]

Summary

During SPV sync, dash_spv emits a large volume of per-packet and per-batch messages at DEBUG level. These flood the log file and make it hard to extract meaningful diagnostics. They should be TRACE since they represent internal network I/O and tight-loop state — useful only when debugging the SPV stack itself.

Observed in a single ~10-minute sync session against Testnet (3 peers):

Message	Current level	Occurrences	Recommended
network::manager: Received "cfilter" from <peer>	DEBUG	~1.5M	TRACE — raw per-packet I/O
network::manager: Request processor: sending getcfilters	DEBUG	1 516	TRACE — internal dispatch detail
network::manager: Distributing getcfilters request to peer	DEBUG	~1 500	TRACE — per-peer copy of above
network::manager: Request processor: sending getcfheaders	DEBUG	762	TRACE
network::manager: Distributing getcfheaders request to peer	DEBUG	757	TRACE
network::manager: Received "cfheaders" from <peer>	DEBUG	756	TRACE
network::manager: Request processor: sending getdata	DEBUG	319	TRACE
network::manager: Request processor: sending getheaders	DEBUG	282	TRACE
sync::filters::manager: scan_batch: no behind wallets with monitored addresses	DEBUG	312	TRACE — tight-loop internal state
validation::filter: Verified 1000 filters successfully	DEBUG	1 505	TRACE or throttle (fires per-batch)

Additional finding — SyncProgress log message is empty

client::event_handler: SyncProgress: fires at INFO level 2 210 times with an empty body — the progress value is not being formatted into the message. The format string appears to be missing {}, or the value does not implement Display. This should be fixed to include the actual progress (e.g., percentage or block height), or downgraded to TRACE if the structured event is the intended signal.

Impact

At DEBUG log level, a 10-minute sync produces millions of lines of noise, making the log file effectively unsearchable for real warnings and errors. Downgrading these to TRACE keeps DEBUG usable for day-to-day diagnostics.