Added real timetable support

docker/patches/README.md

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+# Local JGRPP patches
+
+The `docker/OpenTTD-patches/` directory is an **untracked** clone of
+[JGRennison/OpenTTD-patches](https://github.com/JGRennison/OpenTTD-patches) checked out at tag
+`jgrpp-0.71.1`. The patches in this directory are the local modifications this project needs on
+top of that tag; they are the durable source of truth (the clone itself is not committed).
+
+Current patches:
+
+- `0001-Add-GameScript-API-timetable-getters-to-ScriptOrder.patch` — adds read-only timetable
+  getters (`GetTimetableWaitTime`, `GetTimetableTravelTime`, `IsWaitTimetabled`,
+  `IsTravelTimetabled`, `IsWaitFixed`, `IsTravelFixed`, `GetLeaveType`, `GetTimetableMaxSpeed`,
+  `GetTimetableLateness`, `GetTimetableStartTick`, `GetCurrentOrderTime`,
+  `GetTimetableTotalDuration`) to the `GSOrder` GameScript class. Required by the AdminBridge
+  GameScript's `get_timetable` command and the Python client's
+  `OpenTTDAdminClient.get_timetable()`.
+
+## Applying after a fresh clone
+
+```bash
+git clone --branch jgrpp-0.71.1 https://github.com/JGRennison/OpenTTD-patches docker/OpenTTD-patches
+git -C docker/OpenTTD-patches am ../patches/*.patch
+```
+
+Then build the image as usual (`docker-compose up -d --build` from `docker/`).
+
+If the clone is updated past `jgrpp-0.71.1`, `git am` may conflict — the patches were generated
+against that tag and need rebasing in that case.