feat: add initial frontend setup with styles, types, and testing framework

- Created a global CSS file for styling the frontend with responsive design.
- Introduced TypeScript types for various entities including Research, Alpha, and Account.
- Implemented Playwright tests for account management and data synchronization workflows.
- Configured TypeScript with strict settings and included necessary libraries.
- Set up Vite as the build tool with React plugin and API proxy configuration.
- Added a Python script to initialize environment variables securely.

backend/app/config.py

@@ -0,0 +1,28 @@
+"""Deployment configuration; secrets are required and never included in API responses."""
+
+from cryptography.fernet import Fernet
+from pydantic import Field, SecretStr, model_validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file="../.env", extra="ignore")
+
+    database_url: str = "postgresql+asyncpg://wq:wq@localhost:5432/wq"
+    admin_username: str = "admin"
+    admin_password: SecretStr = Field(min_length=12)
+    encryption_key: SecretStr
+    public_origin: str = "http://localhost:8080"
+    cookie_secure: bool = False
+    session_hours: int = Field(default=24, ge=1, le=168)
+    wq_base_url: str = "https://api.worldquantbrain.com"
+    request_timeout: float = 30
+    retry_attempts: int = Field(default=4, ge=1, le=8)
+    enable_runner: bool = True
+
+    @model_validator(mode="after")
+    def validate_secrets(self):
+        Fernet(self.encryption_key.get_secret_value().encode())
+        if self.cookie_secure and not self.public_origin.startswith("https://"):
+            raise ValueError("COOKIE_SECURE requires an HTTPS PUBLIC_ORIGIN")
+        return self