feat: restructure GitHub workflows; add CI workflow, update publish process, and remove obsolete test and lint workflows

CHANGELOG.md

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+# Changelog
+
+All notable changes to pyfragment are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project uses [Calendar Versioning](https://calver.org/) (`YYYY.MINOR.MICRO`).
+
+---
+
+## [2026.0.1] — 2026-03-16
+
+### Added
+- Initial stable release of `pyfragment`
+- `FragmentClient` — async client for the Fragment.com API
+- `gift_premium(username, months)` — purchase Telegram Premium for any user (3, 6, or 12 months)
+- `gift_stars(username, amount)` — send Telegram Stars to any user (50–1,000,000)
+- `topup_ton(username, amount)` — top up TON Ads balance (1–1,000,000,000 TON)
+- `get_wallet()` — fetch wallet address and balance
+- Support for TON wallet versions `V4R2` and `V5R1`
+- Structured exception hierarchy (`FragmentError`, `ConfigurationError`, `CookieError`, etc.)
+- `py.typed` marker — full PEP 561 typing support for type-checkers
+
+[2026.0.1]: https://github.com/bohd4nx/pyfragment/releases/tag/v2026.0.1