Reworked project structure and added multi-arch build

Fix multiarch.yml

Read values for TELEGRAM_API_ID and TELEGRAM_API_HASH from files specified by
TELEGRAM_API_ID_FILE and TELEGRAM_API_HASH_FILE respectively. This allows
for better management of sensitive information through Docker secrets.

- Avoid using eval
- Add validation logic for environment variables existence

feat: use TELEGRAM_HTTP_PORT env to set the api server listening port

Add docker secrets support for TELEGRAM_API_ID and TELEGRAM_API_HASH

Change the shebang to use env, add helper functions to handle environment variables, and dynamically append command arguments. This improves script flexibility and ensures critical variables are set or loaded from files.

feat(nginx): support `local-mode` file paths

chore(docker): update `docker-compose.yml`

This reverts commit 00f66ba.