Initial commit - Journey book (kniha jízd) automation system

Features:
- FastAPI backend for scraping attendance and journey book data
- Deterministic kilometer distribution with random variance
- Refueling form filling with km values
- Next.js frontend with date range selector
- Docker deployment setup

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/lib/api.ts

@@ -0,0 +1,22 @@
+const API_URL = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:8000'
+
+export const apiClient = {
+  async post(endpoint: string, data: any) {
+    const response = await fetch(`${API_URL}${endpoint}`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(data),
+    })
+
+    if (!response.ok) {
+      const errorData = await response.json()
+      throw new Error(errorData.detail || 'Request failed')
+    }
+
+    return response
+  }
+}
+
+export default API_URL