Rename Reticulum MeshChat to Crosstalk across the codebase and packaging. Renamed meshchat.py to crosstalk.py and updated Dockerfile, docker-compose, GitHub Actions, README, docs and electron assets to use Crosstalk, new storage/reticulum config paths (~/.crosstalk/.reticulum), and GHCR tags/labels. Add logic to seed a default RMAP World TCP client interface and a config flag, shorten interface/transport responses to remove forced restart messages, and update database proxy comment. Electron: set app name, implement an internal prompt (replacing electron-prompt), expose restart-backend IPC, change backend executable naming/launching (startBackend/start/stop handling), and adjust portable storage behavior. Misc: remove donate.md, add example image and egg-info files, and apply multiple frontend/component and static asset updates to match rebrand and UX improvements.
