yeti-switch/yeti-web ? reverse-engineered prompt

Build me the Yeti admin web app for a SIP SBC and VoIP billing system.

I want a Rails based admin interface that can connect to the main Yeti database and the separate CDR database, with a basic login page and a working admin dashboard after sign in. It should let me manage the core telecom data, including network prefixes, countries, networks, and other system settings, and it should feel like a real internal operations tool for billing and softswitch administration.

Please set it up so I can run it locally with PostgreSQL, load the schema and seed data, and start using it right away with the default admin account from the README. If there are any missing config files or environment details needed, create sensible examples for them. Make sure the app is ready for development and test runs, and keep the structure clean enough that I can continue building out the telecom features later. If you need to check current Rails or Postgres docs, look them up online.