Add best share analysis page, miner column, and UI improvements

- Best share page: hex + binary hash comparison against network target,
  per-bit coloring showing exactly which bits prevented a valid block,
  toggle between network diff at time of finding vs current diff
- Capture best share hash from ckpool logs with one-time backfill
- Persist network difficulty at time of best share for historical accuracy
- Add miner (worker) column to blocks table via coinbase address matching
- Truncate block hashes in table with full hash on hover
- Increase hashrate chart Y-axis to 7 ticks for better readability

api/cmd/kamado-api/main.go

@@ -65,6 +65,7 @@ func main() {
 	agg := state.New(ck, rpc, cfg.PollInterval, log)
 	agg.Store = blockStore
 	agg.MempoolBaseURL = cfg.MempoolBaseURL
+	agg.LogFilePath = cfg.CKPoolLogFile
 
 	// Transaction accelerator (prioritisetransaction).
 	var accSvc *accelerator.Service
@@ -136,6 +137,7 @@ func main() {
 	go agg.IngestBlockEvents(ctx, tailer.Events)
 	go agg.IngestAttemptEvents(ctx, tailer.Attempts)
 	go agg.IngestLatencyEvents(ctx, tailer.Latencies)
+	go agg.IngestShareEvents(ctx, tailer.Shares)
 
 	if accSvc != nil {
 		go accSvc.Cleanup(ctx)