fix(ccc): fix CCC build errors

[Thegaram]

1. Purpose or design rationale of this PR

Errors:

Error: rollup/circuitcapacitychecker/impl.go:150:68: undefined: unit64
Error: rollup/circuitcapacitychecker/impl.go:162:5: undefined: err
Error: rollup/circuitcapacitychecker/impl.go:162:66: undefined: err
Error: rollup/circuitcapacitychecker/impl.go:163:78: undefined: err
Error: rollup/circuitcapacitychecker/impl.go:171:25: undefined: unit64

Fixes:

- func (ccc *CircuitCapacityChecker) CheckTxNum(expected int) (bool, unit64, error) {
+ func (ccc *CircuitCapacityChecker) CheckTxNum(expected int) (bool, uint64, error) {

- if err = json.Unmarshal([]byte(C.GoString(rawResult)), result); err != nil {
+ if err := json.Unmarshal([]byte(C.GoString(rawResult)), result); err != nil {

Additional fix: Return detailed error instead of ErrUnknown.

2. PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• fix: A bug fix

3. Deployment tag versioning

Has the version in params/version.go been updated?

• This PR doesn't involve a new deployment, git tag, docker image tag, and it doesn't affect traces
• Yes

4. Breaking change label

Does this PR have the breaking-change label?

• This PR is not a breaking change
• Yes

[Thegaram]

Tested on a VM, still getting this error:

# github.com/scroll-tech/go-ethereum/rollup/circuitcapacitychecker
/usr/bin/ld: $WORK/b277/_x002.o: in function `_cgo_1c072de711fe_Cfunc_get_tx_num':
/tmp/go-build/cgo-gcc-prolog:102: undefined reference to `get_tx_num'
collect2: error: ld returned 1 exit status

[silathdiir]

sorry for not building after fixing, thanks.