feat(settings): allow turning off most features

[tangcent]

Most plugin features can now be turned off from the Features tab. API
scanning (with automatic and concurrent scan options) and editor
integration are now toggleable alongside the export channels, field
formats, and frameworks, all in one place.

Turning a feature off now takes effect immediately without restarting
the IDE: the API scan lifecycle starts, stops, or pauses on the fly, the
dashboard and editor line markers reflect the current state, and a
manual rescan stays available even when continuous scanning is turned
off. Stale automatic updates are discarded so the last good results
remain visible until a fresh scan completes.

Developer notes: feature state flows through a project feature registry
with stable IDs, dependency resolution, and isolated settings
transactions; legacy channel/format/framework override arrays are
bridged into it. The API scan controller runs a serialized,
generation-scoped lifecycle that rejects stale work and retains the
last successful snapshot. The build accepts JDK 17 or 21 while still
targeting JDK 17 bytecode.

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-api-3.1.8.252.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[codecov]

Codecov Report

❌ Patch coverage is 70.62147% with 468 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.795%. Comparing base (bd25aa6) to head (46d62f8).

Files with missing lines	Patch %	Lines
...syapi/core/cache/api/ApiScanLifecycleController.kt	59.472%	142 Missing and 27 partials ⚠️
...tangcent/easyapi/core/cache/api/ApiIndexManager.kt	52.280%	135 Missing and 22 partials ⚠️
...nt/easyapi/core/cache/api/ApiFileChangeListener.kt	68.041%	23 Missing and 8 partials ⚠️
...t/easyapi/core/settings/ui/FeatureSettingsPanel.kt	69.880%	8 Missing and 17 partials ⚠️
...ngcent/easyapi/core/dashboard/ApiDashboardPanel.kt	74.667%	13 Missing and 6 partials ⚠️
.../itangcent/easyapi/core/feature/FeatureRegistry.kt	80.000%	11 Missing and 1 partial ⚠️
...tangcent/easyapi/core/feature/FeatureDescriptor.kt	78.431%	1 Missing and 10 partials ⚠️
...core/ide/linemarker/ApiMethodLineMarkerProvider.kt	66.667%	5 Missing and 6 partials ⚠️
...cent/easyapi/core/cache/VcsBranchChangeListener.kt	85.714%	6 Missing and 1 partial ⚠️
...angcent/easyapi/core/feature/FeatureStateBridge.kt	92.188%	2 Missing and 3 partials ⚠️
... and 8 more

Additional details and impacted files

@@              Coverage Diff              @@
##            master      #750       +/-   ##
=============================================
- Coverage   67.246%   66.795%   -0.451%     
=============================================
  Files          431       442       +11     
  Lines        24736     25936     +1200     
  Branches      6009      6191      +182     
=============================================
+ Hits         16634     17324      +690     
- Misses        5838      6291      +453     
- Partials      2264      2321       +57     

Flag	Coverage Δ
unittests	66.795% <70.621%> (-0.451%)	⬇️

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

Files with missing lines	Coverage Δ
...pi/core/dashboard/ApiDashboardToolWindowFactory.kt	100.000% <100.000%> (ø)
...ent/easyapi/core/feature/CoreFeatureContributor.kt	100.000% <100.000%> (ø)
...t/easyapi/core/feature/LegacyFeatureContributor.kt	100.000% <100.000%> (ø)
.../itangcent/easyapi/core/psi/helper/SourceHelper.kt	23.913% <100.000%> (-2.174%)	⬇️
...angcent/easyapi/core/feature/FeatureContributor.kt	93.750% <93.750%> (ø)
...t/easyapi/core/feature/LegacyFeatureStateBridge.kt	96.429% <96.429%> (ø)
...ngcent/easyapi/core/ide/ApiIndexStartupActivity.kt	12.500% <0.000%> (+5.833%)	⬆️
...angcent/easyapi/core/settings/ui/SettingsPanels.kt	66.282% <66.667%> (-3.050%)	⬇️
...n/com/itangcent/easyapi/core/cache/api/ApiIndex.kt	88.333% <92.683%> (+0.614%)	⬆️
...easyapi/core/feature/FeatureSettingsTransaction.kt	85.714% <85.714%> (ø)
... and 12 more

... and 13 files with indirect coverage changes

---

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[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-api-3.1.8.252.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.