Refactor code structure for improved readability and maintainability

services/bff/pyproject.toml

@@ -0,0 +1,31 @@
+[project]
+name = "train-watcher-bff"
+version = "0.1.0"
+requires-python = ">=3.14"
+dependencies = [
+  "alembic>=1.16.0",
+  "boto3>=1.38.23",
+  "fastapi[standard]>=0.115.12",
+  "email-validator>=2.2.0",
+  "httpx>=0.28.1",
+  "psycopg[binary]>=3.2.9",
+  "pydantic-settings>=2.9.1",
+  "pyjwt>=2.10.1",
+  "pwdlib[argon2]>=0.2.1",
+  "python-multipart>=0.0.20",
+  "sqlalchemy>=2.0.41",
+]
+
+[dependency-groups]
+dev = [
+  "pytest>=8.3.5",
+  "ruff>=0.11.11",
+  "ty>=0.0.1a6",
+]
+
+[tool.ruff]
+line-length = 100
+target-version = "py314"
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "UP", "B"]