🗑️ Remove Alembic migration system completely

- Remove alembic/ directory and alembic.ini file
- Remove Alembic references from pyproject.toml, mypy.ini
- Remove migration logic from main.py
- Update CHANGELOG.md with removal details
- Clean up all configuration files from Alembic settings

pyproject.toml

@@ -370,14 +370,12 @@ strict_equality = true
 exclude = [
     "venv/",
     ".venv/",
-    "tests/",
-    "*/migrations/*",
+    "tests/"
 ]
 
 # Настройки для конкретных модулей
 [[tool.mypy.overrides]]
 module = [
-    
     "tests.*",
 ]
 ignore_missing_imports = true