refactor(observability): new observability infra based on OTeL

[Becks723]

自查 PR 结构

• PR 标题符合这个格式: <type>(optional scope): <description>

• 此 PR 标题的描述以用户为导向，足够清晰，其他人可以理解。

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• 这个 PR 属于强制变更/破坏性更改

如果是，请在 PR 标题中添加 BREAKING CHANGE 前缀，并在 PR 描述中详细说明。

这个 PR 的类型是什么？

这个 PR 做了什么 / 我们为什么需要这个 PR？

一个可以算作 feature 的可观测性基础设施，支持导出为 Otel traces & logs

• 方案：https://west2-online.feishu.cn/wiki/QCyKwL4YGicgJgk1GWUcz3gLnqe
• 落地：https://becks723.github.io/2026/04/16/记福uu链路追踪重构/

(可选)这个 PR 解决了哪个/些 issue？

对 Reviewer 预留的一些提醒

[ozline]

可以先修一下 CI

[Becks723]

unit test 没过好像不是我的问题:\

[FantasyRL]

unit test 没过好像不是我的问题:\

现在没过这单测也能合就是了

[renbaoshuo]

merge 一下主分支，那边单测是好的了现在

[codecov]

Codecov Report

❌ Patch coverage is 49.22280% with 98 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/tracing/provider.go	20.40%	38 Missing and 1 partial ⚠️
pkg/logger/context.go	35.71%	35 Missing and 1 partial ⚠️
pkg/base/client/cache.go	0.00%	5 Missing ⚠️
internal/user/service/bind_friend.go	0.00%	4 Missing ⚠️
pkg/base/client/db.go	0.00%	4 Missing ⚠️
pkg/logger/logger.go	71.42%	4 Missing ⚠️
pkg/tracing/shutdown.go	66.66%	1 Missing and 1 partial ⚠️
internal/academic/service/get_scores.go	0.00%	1 Missing ⚠️
pkg/base/client/rpc.go	0.00%	1 Missing ⚠️
pkg/base/server/config.go	0.00%	1 Missing ⚠️
... and 1 more

@@            Coverage Diff             @@
##             main     #464      +/-   ##
==========================================
- Coverage   62.95%   62.71%   -0.24%     
==========================================
  Files         224      230       +6     
  Lines        5852     6027     +175     
==========================================
+ Hits         3684     3780      +96     
- Misses       2051     2126      +75     
- Partials      117      121       +4     

Flag	Coverage Δ
unittest	62.71% <49.22%> (-0.24%)	⬇️

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

Files with missing lines	Coverage Δ
api/handler/trace_ping.go	100.00% <100.00%> (ø)
internal/oa/service/feedback_service.go	100.00% <100.00%> (ø)
internal/user/service/get_friend_config.go	100.00% <100.00%> (ø)
internal/user/service/reorder_friend.go	100.00% <100.00%> (ø)
pkg/logger/otellog.go	100.00% <100.00%> (ø)
pkg/logger/tracing.go	100.00% <100.00%> (ø)
internal/academic/service/get_scores.go	82.50% <0.00%> (ø)
pkg/base/client/rpc.go	0.00% <0.00%> (ø)
pkg/base/server/config.go	0.00% <0.00%> (ø)
pkg/taskqueue/queue.go	32.72% <92.85%> (+32.72%)	⬆️
... and 7 more

... and 2 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[FantasyRL]

TL;DR

[linrongda]

为什么这个 docker-compose 是单独开的，而不是合并在 /docker/docker-compose.yml 里面