fix(raft): 新增 NewRaftWithDataDir, 修复 raft_test.go 编译

[NeverENG]

Summary

• Raft/raft.go 新增 NewRaftWithDataDir(peers, me, dataDir), 让测试能注入隔离的数据目录
• NewRaft(peers, me) 内部转调 NewRaftWithDataDir(..., \"raft_data\") 保持线上行为
• raft_test.go 中 14 处调用现在能正常编译

Background

raft_test.go 一直在调一个不存在的 NewRaftWithDataDir 函数, 整个 Raft 包测试无法编译。CI 当前只跑 go vet/go build 没碰测试, 所以一直漏。

Test plan

• `go build ./Raft/...` 通过
• `go vet ./Raft/...` 通过
• 清掉残留 `raft_data/raft_test_data_*` 后, raft_test.go 14 个用例本地全部通过

已知遗留（不在本 PR 内修）

• `rpc_test.go` 的 `TestAppendEntriesRPC` 在本地存在跨用例污染 + 运行时 panic, 与 raft_test 编译失败无关; 单独 PR 处理。
• `Raft/raft_test_data_*` 目录被意外签入历史, 建议补 `.gitignore` 规则 (单独 PR)。

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Raft data storage location is now configurable. Users can specify custom persistence paths instead of being limited to the default location, providing greater flexibility for deployment and infrastructure customization.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 76752253-6b16-4341-95fe-b1553d3d11b2

📥 Commits

Reviewing files that changed from the base of the PR and between 8686436 and d2799e8.

📒 Files selected for processing (1)

• Raft/raft.go

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📝 Walkthrough

Walkthrough

NewRaft now delegates to NewRaftWithDataDir with the default "raft_data" directory. NewRaftWithDataDir uses the provided dataDir parameter for WAL initialization instead of a hardcoded value, making the persistence location configurable.

Changes

WAL Directory Configuration

Layer / File(s)	Summary
WAL directory parameterization Raft/raft.go	NewRaft delegates to NewRaftWithDataDir with the default "raft_data" directory. NewRaftWithDataDir initializes the WAL using the provided dataDir parameter instead of hardcoded "raft_data", enabling configurable persistence locations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Flexibility blooms when paths are set free,
No longer bound to "raft_data" decree,
A simple delegation, a parameter's grace,
Now builders can choose their persistence place! ✨

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/raft-test

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