Adds packages/kilo-jetbrains/ — a Gradle project scaffolded for the
IntelliJ Platform using the split mode (frontend/backend/shared modules).
Plugin ID ai.kilocode.jetbrains, version 7.0.1, Kilo logo icon.
Also adds .idea/gradle.xml to auto-link the Gradle project when opening
the monorepo in IntelliJ, and a Run JetBrains Plugin run configuration
for runIde. Updates .gitignore to track .idea/gradle.xml and .idea/.run
while keeping all other .idea/ contents ignored.
kirillk