feat(io): MapView model (CellState, RoomCell, Connection, MapView)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/text/CellState.java

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+package thb.jeanluc.adventure.io.text;
+
+/** Fog-of-war state of a room on the map. */
+public enum CellState { CURRENT, VISITED, KNOWN }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/text/Connection.java

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+package thb.jeanluc.adventure.io.text;
+
+/** A corridor between two placed rooms. */
+public record Connection(RoomCell from, RoomCell to) {}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/text/MapView.java

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+package thb.jeanluc.adventure.io.text;
+
+import java.util.List;
+
+/** Frontend-agnostic snapshot of the visible map: placed cells + connections. */
+public record MapView(List<RoomCell> cells, List<Connection> connections) {
+    public MapView {
+        cells = List.copyOf(cells);
+        connections = List.copyOf(connections);
+    }
+}

Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/text/RoomCell.java

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+package thb.jeanluc.adventure.io.text;
+
+/** A room placed on the map grid at integer coords, with its fog-of-war state. */
+public record RoomCell(String id, String name, int x, int y, CellState state) {}