feat: setup SvelteKit frontend with TypeScript

Implemented issue #9 - Frontend Project Setup with Svelte and TypeScript.

Changes:
- Created SvelteKit project with TypeScript
- Set up routing structure:
  - / (landing page)
  - /login
  - /register
  - /dashboard
  - /bot/[id]
  - /bot/[id]/backtest
  - /bot/[id]/simulate
  - /settings
- Created Svelte stores for state management:
  - userStore - Current user info
  - botsStore - List of user's bots
  - currentBotStore - Selected bot
  - chatStore - Chat messages
  - backtestStore - Backtest results
  - simulationStore - Simulation signals
  - authStore - Authentication state
- Created API client for backend communication
- Set up environment variables (.env.example)
- Created auth store with protected routes and login/register functionality

src/frontend/.vscode/extensions.json

@@ -0,0 +1,3 @@
+{
+	"recommendations": ["svelte.svelte-vscode"]
+}