fix: restore Go module build and normalize segwit HRP checks

[tolga-tom-nook]

Summary

This restores a clean Go module build for bitgesell-utxo-dump after the repository was moved under BitgesellOfficial:

• adds a root go.mod / go.sum for the current package tree;
• updates stale imports from naftalimurgor / in3rsha paths to the canonical github.com/BitgesellOfficial/bitgesell-utxo-dump module path;
• fixes a fmt.Println formatting misuse so the package passes go test ./... cleanly.

RED / GREEN proof

RED on upstream origin/main (02ec2c1):

$ go test ./...
pattern ./...: directory prefix . does not contain main module or its selected dependencies

GREEN on this branch:

$ go test ./...
?   	github.com/BitgesellOfficial/bitgesell-utxo-dump	[no test files]
?   	github.com/BitgesellOfficial/bitgesell-utxo-dump/src/bitgesell/bech32	[no test files]
?   	github.com/BitgesellOfficial/bitgesell-utxo-dump/src/bitgesell/bglleveldb	[no test files]
?   	github.com/BitgesellOfficial/bitgesell-utxo-dump/src/bitgesell/crypto	[no test files]
?   	github.com/BitgesellOfficial/bitgesell-utxo-dump/src/bitgesell/keys	[no test files]

git diff --check origin/main...HEAD is clean.

Bounty context

Submitted for the Bitgesell improvement / PR bounty program:

• BGL (Bitgesell) Bounty/Improvement Program ($50000 budget) bitgesell#81
• BGL PR bounty hunt ($10000 overall budget) bitgesell#39

Payout address, if accepted: 0x4a76c7E64C08cF29B59eFC640b4ada97A270d428 (EVM/USDT-compatible).

Additional validation/update (2026-06-05):

• Added a focused Bech32/SegWit regression test for all-uppercase HRP/address round-tripping.
• Fixed SegwitAddrDecode to normalize the expected HRP before comparing it with Decode's lowercased HRP result. This keeps the decoder consistent with the package's own Encode("BGL", ...) behavior and avoids rejecting valid all-uppercase Bech32 strings.
• Validation:
  • go test ./src/bitgesell/bech32 -run TestSegwitAddrDecodeAcceptsUppercaseHRP -count=1
  • go test ./...
  • git diff --check

[MyTH-zyxeon]

Review-assist note for the Bitgesell #81 improvement lane.

I checked the public PR body and diff. This is a focused Go module/build restoration fix:

• adds a root go.mod and go.sum so go test ./... has a module context after the repository move
• updates stale import paths from naftalimurgor / in3rsha to the canonical github.com/BitgesellOfficial/bitgesell-utxo-dump module path
• fixes the fmt.Println formatting misuse by using fmt.Printf where an error value is interpolated
• keeps the change scoped to build/import correctness and does not touch wallet keys, chainstate parsing semantics, or live-chain behavior

Suggested maintainer checks before merge:

• run go test ./...
• run go mod tidy and confirm it does not introduce unexpected dependency churn
• grep for remaining stale naftalimurgor and in3rsha import paths
• confirm the selected Go version/dependency versions match the project support policy before tagging a release

From the public patch shape, this looks like a useful low-risk build/testability candidate for the #81 improvement queue. I did not run Go, parse chainstate, access wallets, payment, or live-chain actions for this review-assist note.