test: add go fuzz tests for key internal functions

[shaoboon]

Changes

• Added 17 Go fuzz targets across DTO JSON processing/validation, DTO↔entity transforms, crypto parsing, and parsing utilities.
• Introduced Makefile targets to discover and run fuzz targets (single target, smoke, and full sequential runs).
• Documented fuzzing workflows and target inventory in README.md and the new FUZZ_TEST.md.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.71%. Comparing base (220e5fa) to head (014a02f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #868      +/-   ##
==========================================
+ Coverage   40.25%   40.71%   +0.46%     
==========================================
  Files         114      114              
  Lines       10866    10866              
==========================================
+ Hits         4374     4424      +50     
+ Misses       6091     6050      -41     
+ Partials      401      392       -9     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

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

[Copilot]

Pull request overview

Adds Go fuzz testing infrastructure and fuzz targets to improve crash-resistance and determinism coverage for internal DTO/JSON handling, use-case transforms, certificate parsing, and interval parsing.

Changes:

• Added 17 Go fuzz targets across DTO JSON processing/validation, DTO↔entity transforms, crypto parsing, and parsing utilities.
• Introduced Makefile targets to discover and run fuzz targets (single target, smoke, and full sequential runs).
• Documented fuzzing workflows and target inventory in README.md and the new FUZZ_TEST.md.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
README.md	Adds user-facing fuzz-testing workflow and Make targets.
Makefile	Adds fuzz-list, fuzz-one, fuzz-smoke, and fuzz-all targets.
FUZZ_TEST.md	Provides detailed fuzz target inventory, strategy, and CI guidance.
internal/entity/dto/v1/json_fuzz_test.go	Fuzzes JSON unmarshal + validator behavior across multiple DTOs using a shared helper.
internal/certificates/generate_fuzz_test.go	Fuzzes PEM cert/key parsing with corrupted/truncated/swapped inputs.
internal/usecase/devices/alarms_fuzz_test.go	Fuzzes ParseInterval for determinism and error stability.
internal/usecase/devices/transform_fuzz_test.go	Fuzzes device DTO↔entity transforms and key invariants (e.g., GUID normalization).
internal/usecase/domains/usecase_fuzz_test.go	Fuzzes PKCS#12 decrypt + expiration checking behavior.
internal/usecase/domains/transform_fuzz_test.go	Fuzzes domain DTO↔entity transforms including expiration parsing behavior.
internal/usecase/ciraconfigs/transform_fuzz_test.go	Fuzzes CIRA config DTO↔entity transforms (with mock crypto).
internal/usecase/profiles/transform_fuzz_test.go	Fuzzes profile DTO↔entity transforms and tag-join invariant.
internal/usecase/profilewificonfigs/transform_fuzz_test.go	Fuzzes profile WiFi config DTO↔entity transforms.
internal/usecase/wificonfigs/transform_fuzz_test.go	Fuzzes wireless config DTO↔entity transforms and link-policy nil handling.
internal/usecase/ieee8021xconfigs/transform_fuzz_test.go	Fuzzes IEEE8021x config DTO↔entity transforms.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 15 out of 15 changed files in this pull request and generated 7 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.