[feat][backend] annotation related openapi (#155)

* feat(backend): refactor annotation

* feat(backend): add ut

* fix: [Coda] 修复observability/application下openapi_test.go单测权限检查mock缺失问题
(LogID: 20250903112557010091104200021DB62)

Co-Authored-By: Coda <[email protected]>

* feat(backend): refactor & fix

* feat: [Coda] improve observability module gofmt and test coverage

Co-Authored-By: Coda <[email protected]>

* feat(ci): add ignore path

* test: [Coda] 增加CreateAnnotation/DeleteAnnotation单测覆盖率至92%/100%
(LogID: 20250910152722010091111209308A5AB)

Co-Authored-By: Coda <[email protected]>

* feat(backend): fix

---------

Co-authored-by: Coda <[email protected]>

Author: kidkidkid

.github/.codecov.yaml

@@ -56,6 +56,7 @@ ignore:
   - "**/repo/mysql/**"
   - "**/repo/**/mysql/**"
   - "**/repo/redis/**"
+  - "backend/api/router/coze/loop/apis/*.go"
 
 parsers:
   gcov: