fix(grpc): Put/Delete 走 kv.Write 修复 standalone 下 nil raft panic

[NeverENG]

Summary by CodeRabbit

• Bug Fixes
  • Improved reliability when storing and deleting data through gRPC.
  • Fixed standalone-mode operations that could previously trigger a runtime error.
• Tests
  • Added coverage confirming that standalone Put and Get operations successfully persist and retrieve values.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 73985cb4-6fe3-4a19-8a18-2b2290f78e35

📥 Commits

Reviewing files that changed from the base of the PR and between bc16d98 and 62b6218.

📒 Files selected for processing (2)

• test_grpc/grpc_server.go
• test_grpc/grpc_server_test.go

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📝 Walkthrough

Walkthrough

The gRPC Put and Delete handlers now persist commands with kv.Write. A standalone-mode test configures an isolated WAL and verifies that a stored value can be retrieved through Put and Get.

Changes

gRPC write flow

Layer / File(s)	Summary
Use Write for RPC commands test_grpc/grpc_server.go	Put and Delete now determine success directly from s.kv.Write(cmd) instead of appending entries and waiting for commits.
Validate standalone Put/Get test_grpc/grpc_server_test.go	Adds standalone-mode setup and cleanup, then verifies Put stores v1 under k1 and Get returns it.

Estimated code review effort: 2 (Simple) | ~10 minutes

✨ 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/grpc-standalone-write

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[github-actions]

🐯 BanGD 数据库内核评审

整体风险：🟢 低

变更总结：该 PR 将 gRPC 层 Put 和 Delete 原本手动调用 kv.AppendEntry + kv.WaitForCommit 的两步操作，替换为调用单步 kv.Write(cmd)。动机是修复 standalone 模式下 raft 为 nil 时的 panic——旧代码在非 Raft 模式下直接调用 AppendEntry（内部访问 raft 指针）会空指针崩溃；而 kv.Write 内部做了模式分发（standalone 走本地写入，cluster 走 Raft）。同时新增了 TestGRPCServer_PutGetStandalone 回归测试。

本评审不阻塞合入；架构级建议以 Issue 形式跟踪，普通问题在下方内联列出。

未发现需要从架构层面改进的问题。

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