Respect EVM version when importing assembly JSON

[0xjc65eth]

Description

EVMAssemblyStack already stores the evmVersion parsed from Standard JSON settings, but the imported assembly JSON path dropped it when constructing Assembly objects. Assembly::fromJSON() therefore used the default EVMVersion{} for both root assemblies and subassemblies.

This PR plumbs the selected EVM version through Assembly::fromJSON() and uses it when constructing imported assemblies. This keeps imported EVM assembly output consistent with the requested target EVM version.

Regression coverage:

• EVMVersion: =paris keeps PUSH 0 encoded as PUSH1 0x0 / 6000.
• EVMVersion: =shanghai still encodes PUSH 0 as PUSH0 / 5f.

Closes #16759.

Checklist

• I have read the contributing guidelines and the review checklist
• I have personally reviewed, understood, and tested every change in this PR

Testing

• scripts/check_style.sh libevmasm/Assembly.h libevmasm/Assembly.cpp libevmasm/EVMAssemblyStack.cpp test/libevmasm/evmAssemblyTests/isoltestTesting/evm_version_push0_paris.asmjson test/libevmasm/evmAssemblyTests/isoltestTesting/evm_version_push0_shanghai.asmjson
• git diff --check

I could not run isoltest locally because this checkout had no configured build directory, and cmake -S . -B build -DCMAKE_BUILD_TYPE=Release stopped at missing Boost 1.83.0.

AI Disclosure

• No AI tools were used
• AI tools were used (details below)

AI assistance was used while preparing this contribution. I reviewed the resulting diff and ran the local checks listed above.