Resolve initProperties KDoc link and remove redundant self-imports

[pambrose]

Summary

Fixes a broken KDoc link and cleans up redundant imports across a handful of files.

ContentDsl.kt — resolve the [initProperties] KDoc link

initProperties() is a companion-object member of Property, which is not in scope in ContentDsl.kt (the file only imports individual Property.X members). So the bare [initProperties] link had nothing to bind to and rendered as plain text — Dokka reported Couldn't resolve link: [initProperties].

Fixed with KDoc's custom-link-text form, which reads cleanly in prose while binding to the fully-qualified target, so no extra import is needed:

[Property.initProperties][com.readingbat.common.Property.initProperties]

Dokka (dokkaGenerateModuleHtml) now generates with zero warnings.

Redundant self-import removals

Property.kt, ConfigureOAuth.kt, GeoInfo.kt, ReadingBatServer.kt, AdminRoutes.kt — each was importing symbols already defined in its own object/companion. Removed.

Intercepts.kt — minor simplification (behavior-preserving)

- if (suffix.isEmpty()) return true
- return suffix.split('/').size <= 2
+ return suffix.isEmpty() || suffix.split('/').size <= 2

Verification

./gradlew check: 364 tests, 0 failures. Dokka module generation clean.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rc/main/kotlin/com/readingbat/server/Intercepts.kt	0.00%	1 Missing ⚠️

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