refactor(contracts): remove OPCMv1 from all Solidity code

[smartcontracts]

Summary

Remove OPContractsManager v1 from all Solidity code, making OPContractsManagerV2 the sole OPCM.

• Delete v1 contract: OPContractsManager.sol (2203 lines, 7 inner contracts) and gut IOPContractsManager.sol interface
• Remove v1 gating: DevFeatures.OPCM_V2 flag, Constants.OPCM_V2_MIN_VERSION, Config.devFeatureOpcmV2()
• Delete v1-only files: AddGameType.s.sol, opcm-upgrade-checks/ directory, 3 test files, 12 snapshot files
• Update deploy scripts: All 10 deploy scripts now unconditionally use V2 types (no more v1/v2 branching)
• Update test infrastructure: ~17 test/setup files cleaned of v1 branches, assertions, and imports

V2 contracts in src/L1/opcm/ are completely untouched — they have zero V1 dependencies.

56 files changed, +212 / -13,404 lines (net deletion of ~13,200 lines)

This is PR 1 of the OPCMv1 removal series. Breaks out the Solidity-side changes from #19385. Go code (op-deployer) and CI matrix changes follow in subsequent PRs.

Test plan

• mise exec -- just build-dev passes (zero compilation errors)
• mise exec -- just pr passes (17/17 checks: lint, semgrep, snapshots, semver-diff, interfaces, size-check, etc.)
• Zero remaining imports of IOPContractsManager or OPContractsManager (non-V2)
• Zero remaining references to DevFeatures.OPCM_V2 or Constants.OPCM_V2_MIN_VERSION
• Zero remaining isOPCMv2 / isOPCMV2 variables
• V2 contracts in src/L1/opcm/ verified untouched
• CI passes (pending)
• mise exec -- just test-dev passes (not yet run — long-running)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.7%. Comparing base (8f8adda) to head (ad56dcc).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #19795     +/-   ##
==========================================
+ Coverage     75.5%    75.7%   +0.2%     
==========================================
  Files          194      138     -56     
  Lines        11275     6749   -4526     
==========================================
- Hits          8515     5113   -3402     
+ Misses        2616     1636    -980     
+ Partials       144        0    -144     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	75.7% <ø> (-4.9%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ages/contracts-bedrock/src/libraries/Constants.sol	100.0% <ø> (ø)
...es/contracts-bedrock/src/libraries/DevFeatures.sol	100.0% <ø> (ø)

... and 59 files with indirect coverage changes

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