fix(os/glog): glog 的 JsonHandler 输出可以导入 ES 的纯 Json (#4790)

[yangyanqing]

Fixes #4790

修改要点

1. 在 ctx 中遍历 CtxKeys 中的 key，如果存在则作为 json 的键值对
2. 用户输入仍根据类型区分
   • json 文本，打平到 json 中
   • 非 json 文本，输出到 Content 字段中

核心：输出满足 jsonl 格式，能直接导入到 ES、LTS 等工具中分析

范例

func Test_Json(t *testing.T) {
	logger := glog.New()
	logger.SetHandlers(glog.HandlerJson)
	logger.SetCtxKeys("Env", "ClientIP")
	logger.Stack(true)

	ctx := context.WithValue(context.Background(), "Env", "prod")
	ctx = context.WithValue(ctx, "ClientIP", "1.2.3.4")
	logger.Info(ctx, g.Map{"uid": 100, "name": "john"})
	logger.Errorf(ctx, "error occurred, %d", 100200)
}

{"ClientIP":"1.2.3.4","Env":"prod","Level":"INFO","Time":"2026-07-02T10:28:08.490+08:00","name":"john","uid":100}
{"ClientIP":"1.2.3.4","Content":"error occurred, 100200","Env":"prod","Level":"ERRO","Time":"2026-07-02T10:28:08.490+08:00"}

[Copilot]

Pull request overview

This PR updates GoFrame’s os/glog JSON handler to emit flat, single-line JSON (JSONL) records that can be directly ingested by log analysis tools (e.g., Elasticsearch/LTS), by (1) exporting configured context keys as top-level JSON fields and (2) flattening JSON-object payloads into the log record instead of embedding them as escaped strings.

Changes:

• Reworked HandlerJson to build a dynamic JSON object, merging context-key values and flattening JSON-object content.
• Added/updated unit tests to validate flattened JSON output, plain string content handling, and collision behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
os/glog/glog_logger_handler_json.go	Replaces struct-based JSON output with map-based output, adds ctx-key export + JSON flattening logic.
os/glog/glog_z_unit_logger_handler_test.go	Updates/adds unit tests to assert JSON handler emits ES-importable flat JSON and handles collisions/content types.

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