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>

backend/models/__init__.py

@@ -0,0 +1,3 @@
+from .journey import Journey, JourneyEntry, RefuelingEntry
+
+__all__ = ["Journey", "JourneyEntry", "RefuelingEntry"]

backend/models/journey.py

@@ -0,0 +1,37 @@
+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel, Field
+
+
+class JourneyEntry(BaseModel):
+    date: str
+    start_km: Optional[int] = None
+    end_km: Optional[int] = None
+    distance_km: Optional[int] = None
+    is_sick_day: bool = False
+    is_vacation: bool = False
+
+
+class RefuelingEntry(BaseModel):
+    date: str
+    amount_liters: float
+    km_at_refuel: Optional[int] = None
+
+
+class Journey(BaseModel):
+    month: str = Field(..., pattern=r"^\d{4}-\d{2}$")
+    start_km: int = Field(..., gt=0)
+    end_km: int = Field(..., gt=0)
+    entries: list[JourneyEntry] = []
+    refueling_entries: list[RefuelingEntry] = []
+
+    class Config:
+        json_schema_extra = {
+            "example": {
+                "month": "2024-03",
+                "start_km": 12000,
+                "end_km": 13500,
+                "entries": [],
+                "refueling_entries": []
+            }
+        }