Lunaris-AOSP/vendor_bcr ? reverse-engineered prompt

Build me the Basic Call Recorder integration for an Android ROM so it can be included as a vendor package and enabled from the device makefile.

I want it to install cleanly on rooted or custom firmware builds, start recording incoming and outgoing phone calls in the background, and stay mostly out of the way once turned on. It should support Android 9 and newer, use the existing vendor setup, and make sure the ROM can inherit the product with the line from the README.

Keep it simple and working, with support for choosing a save location, recording formats, and the basic permissions and boot behavior needed for call recording. If anything needs current Android build guidance, look up the latest docs online and make it fit this tree as a ROM vendor component.