Feature/delta team/epic r04 (#7)

## Summary

epic r04 - begin refactor

## Change Type

- [x] Cowork feature
- [ ] Bug fix
- [ ] Core AI contribution
- [ ] Test / hardening
- [ ] Performance
- [ ] Documentation

## Related Work

Cowork Task:

Core Repo: http://34.143.229.138/gitea-admin/fsg-ai-core-assets

Core AI Issue:

Core Task:

Related PR:

## Scope

What is intentionally included?

What is intentionally NOT included?

## Validation

- [ ] Unit tests
- [ ] Integration tests
- [ ] Manual verification
- [ ] Regression check

Commands / evidence:

## Security Impact

Permission / credential / network / customer data impact:

## Compatibility

- [ ] No breaking change
- [ ] Breaking change documented

## Reviewer Notes

Anything Cowork reviewers should pay attention to.

---------

Co-authored-by: Anh Tran Nguyen Minh <anhtnm1@fpt.com>
Co-authored-by: Huong Le Thi Thien <huongltt35@fpt.com>
Co-authored-by: Nam Pham Dinh Thanh <nampdt@fpt.com>
Co-authored-by: Vu Dam Tuan <vudt15@fpt.com>
Co-authored-by: Hiep Ha Van <hiephv3@fpt.com>
Co-authored-by: Lam Hoang Van <lamhv7@fpt.com>
Reviewed-on: #7
Co-authored-by: Duy Le Huu <duylh19@fpt.com>

.gitignore

@@ -28,7 +28,10 @@ bower_components/
 .env.preview
 *.pem
 *.key
-secrets/
+# Neo vào gốc repo: mẫu không neo nuốt MỌI thư mục tên secrets ở mọi độ
+# sâu — nó đã âm thầm chặn infrastructure/secrets/ (mã nguồn, không phải
+# bí mật) khỏi repo suốt 21-22/08.
+/secrets/
 credentials.json
 .npmrc
 .yarnrc
@@ -36,9 +39,11 @@ credentials.json
 # =============================================================================
 # Build & Distribution
 # =============================================================================
-dist/
-build/
-out/
+# Neo vao goc — mau khong neo se nuot moi thu muc trung ten o moi do sau,
+# ke ca ma nguon. Da mac dung loi do voi secrets/ (xem khoi Credentials).
+/dist/
+/build/
+/out/
 .next/
 .nuxt/
 .output/
@@ -73,7 +78,8 @@ desktop.ini
 # Logs & Debug
 # =============================================================================
 *.log
-logs/
+# Neo vao goc: infrastructure/logs/ la ma nguon, khong phai log chay may.
+/logs/
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*