docs: update changelog for v1.7.3

CHANGELOG.md

@@ -5,6 +5,25 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.7.3] - 2026-03-06
+
+### Added
+
+- Nginx reverse proxy configuration — SSL termination, HTTP→HTTPS redirect, proxy to uvicorn
+- `scripts/init-letsencrypt.sh` — automated Let's Encrypt certificate provisioning via certbot webroot challenge
+- Request logging for Evotor token exchange errors to aid debugging
+
+### Fixed
+
+- Evotor OAuth token exchange — move `client_id` and `client_secret` from HTTP Basic Auth to form body fields (resolves `invalid_client` errors)
+- Docker environment — pass `EVOTOR_CLIENT_ID` and `EVOTOR_CLIENT_SECRET` to web container via docker-compose
+
+### Changed
+
+- Default `BASE_URL` changed to `https://evosync.ru` for production deployment
+- `docker-compose.yml` — web service now exposes port 8000 internally only (accessed via nginx)
+- Added `refresh_token` field to `EvotorConnection` model for future token refresh logic
+
 ## [1.8.0] - 2026-03-06
 
 ### Added