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.

docker-compose.yml

@@ -84,25 +84,25 @@ services:
   # ========================
   # Frontend (Nginx serving prebuilt dist)
   # ========================
-  frontend:
-    build:
-      context: .
-      dockerfile: frontend/Dockerfile
-      args:
-        RUNTIME_IMAGE: ${IMAGE_PREFIX:-}nginx:1.25-alpine
-    container_name: quantdinger-frontend
-    restart: unless-stopped
-    ports:
-      - "${FRONTEND_PORT:-8888}:80"
-    depends_on:
-      - backend
-    networks:
-      - quantdinger-network
-    healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost/health"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
+  # frontend:
+  #   build:
+  #     context: .
+  #     dockerfile: frontend/Dockerfile
+  #     args:
+  #       RUNTIME_IMAGE: ${IMAGE_PREFIX:-}nginx:1.25-alpine
+  #   container_name: quantdinger-frontend
+  #   restart: unless-stopped
+  #   ports:
+  #     - "${FRONTEND_PORT:-8888}:80"
+  #   depends_on:
+  #     - backend
+  #   networks:
+  #     - quantdinger-network
+  #   healthcheck:
+  #     test: ["CMD", "curl", "-f", "http://localhost/health"]
+  #     interval: 30s
+  #     timeout: 10s
+  #     retries: 3
 
 volumes:
   postgres_data: