Fix MILP never solving

Merge: keep MILP+DiscreteHazard planner

Use simulated annealing planner for submission

Refactor planner to implement MILP-based scheduling and replace OrderedPlanner

Improve planner with 14-day safety buffer

Improve RUL prediction with time-series features

Add official BatterySwapAI example submission

Added dataset download script and gitignore

initial commit