feat/fix: Rich token usage popovers, robust LiteLLM context window bounds logic, and Skill management refactor

Fix: Localized UI verification feedback for Swarm/OIDC testing, UI locking pre-validation, password fallback parsing fix, and icon corrections

Refactor AI Config and Fix Login failure: Migrated services to a structured api directory, updated backend schemas for multiple TTS/STT providers, and improved settings/chat UI coverage.