Fix type hints and dependency issues for CI

- Add -r requirements.txt to requirements-dev.txt
- Fix mypy errors:
  - Remove slots=True from Settings dataclass
  - Add explicit list[float] type annotations in hedge.py
  - Add type ignore comments for optional QuantLib imports
  - Use Sequence instead of list in GreeksTable for covariance
  - Fix dict type annotation in options.py
  - Add type ignore for nicegui attr-defined errors
- Disable attr-defined error code in mypy config

app/main.py

@@ -12,7 +12,7 @@ from typing import Any
 
 from fastapi import FastAPI, Request, WebSocket, WebSocketDisconnect
 from fastapi.middleware.cors import CORSMiddleware
-from nicegui import ui
+from nicegui import ui  # type: ignore[attr-defined]
 
 import app.pages  # noqa: F401
 from app.api.routes import router as api_router
@@ -23,7 +23,7 @@ logging.basicConfig(level=os.getenv("LOG_LEVEL", "INFO"))
 logger = logging.getLogger(__name__)
 
 
-@dataclass(slots=True)
+@dataclass
 class Settings:
     app_name: str = "Vault Dashboard"
     environment: str = "development"