docs: document isExtend FQN contract

[tangcent]

Summary

• Documents the FQN contract on both script-facing isExtend declarations (ClassContext, ScriptTypeContext): the superClass argument must be the fully qualified name; a simple name silently never matches
• Fixes the method.return.main rule example in EndpointBuilder that used a bare "Result" — the exact mistake the contract docs now prevent
• Drops redundant ApiHeader / ApiParameter imports in EndpointBuilder (both types live in the same package core.export)

Testing

• No runtime behavior change (imports + KDoc only)
• Verified via full-repo search that the fixed example was the only isExtend/isInheritor call site passing a simple class name; all other usages (including built-in .config rule files such as jackson.config and *-validation-strict.config) already pass fully qualified names, traced through annValue/annMaps normalization (type.canonicalText) and qualifiedName() sources

Risks / Rollback

None — zero behavioral impact. Revert the commit to roll back.

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-api-3.1.9.252.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-api-3.1.9.252.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-api-3.1.9.252.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.795%. Comparing base (64292af) to head (c5a54bb).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #753   +/-   ##
=========================================
  Coverage   66.795%   66.795%           
=========================================
  Files          442       442           
  Lines        25936     25936           
  Branches      6191      6191           
=========================================
  Hits         17324     17324           
  Misses        6291      6291           
  Partials      2321      2321           

Flag	Coverage Δ
unittests	66.795% <ø> (ø)

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

Files with missing lines	Coverage Δ
...m/itangcent/easyapi/core/export/EndpointBuilder.kt	79.808% <ø> (ø)
...ent/easyapi/core/rule/context/ScriptPsiContexts.kt	49.573% <ø> (ø)

---

Continue to review full report in Codecov by Harness.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 64292af...c5a54bb. Read the comment docs.

🚀 New features to boost your workflow:

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