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/.gitignore

@@ -0,0 +1,23 @@
+node_modules
+
+# Output
+.output
+.vercel
+.netlify
+.wrangler
+/.svelte-kit
+/build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*