Refactor code for improved readability and consistency

- Cleaned up whitespace and formatting in various files including http.py, language.py, logger.py, safe_exec.py, and SQL migration scripts.
- Consolidated import statements and removed unnecessary blank lines.
- Updated logging configuration for better clarity.
- Enhanced the safe execution code with improved error handling and logging.
- Removed commented-out code and unnecessary variables in backfill_zero_trades.py and other scripts.
- Added a pyproject.toml for Ruff and Vulture configuration.
- Introduced requirements-dev.txt for development dependencies.
- Removed commented-out stock entries in init.sql for cleaner migration scripts.

backend_api_python/pyproject.toml

@@ -0,0 +1,32 @@
+[tool.ruff]
+line-length = 120
+target-version = "py312"
+extend-exclude = [
+  ".git",
+  ".venv",
+  "__pycache__",
+  "migrations",
+]
+
+[tool.ruff.lint]
+select = ["E4", "E7", "E9", "F", "I"]
+
+[tool.ruff.format]
+indent-style = "space"
+line-ending = "lf"
+quote-style = "double"
+
+[tool.vulture]
+paths = ["app", "scripts", "run.py", "gunicorn_config.py"]
+exclude = ["migrations/", "__pycache__/"]
+ignore_decorators = [
+  "@*.route",
+  "@*.get",
+  "@*.post",
+  "@*.put",
+  "@*.patch",
+  "@*.delete",
+  "@*.errorhandler",
+]
+ignore_names = ["test_*"]
+min_confidence = 80