refactor: hide internal packages and main() from Dokka docs

[sriniketh]

Summary

• Made parseFile() in dev.sriniketh.helpers package internal to exclude from Dokka docs
• Made LibrariesAndLicenses, Library, License model classes internal to exclude from Dokka docs
• Added suppressedFiles config for Main.kt since the entry point main() function cannot be made internal

Dokka V2 only documents PUBLIC/PROTECTED by default, so internal visibility automatically hides these from generated documentation.

Test plan

• ./gradlew allTests — all tests pass (internal is visible to same-module test sources)
• ./gradlew compileKotlinMacosArm64 — compiles successfully
• ./gradlew dokkaGenerate — verified dev.sriniketh.helpers/, dev.sriniketh.models/, and main.html are no longer in output
• Public API docs (UUID, hash, encoding functions, etc.) still present

🤖 Generated with Claude Code