Add basic map pin functionality

- Define Point structure for 3D coordinates
- Add map pin type constants
- Implement placeholder functions for:
  * Player location loading
  * Map pin addition
  * Pin counting
- Foundation for Korok seed tracking

source/map_basic.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <math.h>
+#include <switch.h>
+#include "map_basic.h"
+
+static Point player_location = {0};
+
+void loadPlayerLocation() {
+    printf("Loading player location...\n");
+    // TODO: Read player position from save data
+    player_location.x = 0.0f;
+    player_location.y = 0.0f; 
+    player_location.z = 0.0f;
+    printf("Player at: (%.1f, %.1f, %.1f)\n", 
+           player_location.x, player_location.y, player_location.z);
+}
+
+void addMapPin(u32 icon, Point location) {
+    printf("Adding map pin at (%.1f, %.1f, %.1f)\n", 
+           location.x, location.y, location.z);
+    // TODO: Implement map pin addition to save data
+}
+
+void countMapPins() {
+    printf("Counting map pins...\n");
+    // TODO: Count existing pins in save data
+    printf("Found 0 map pins\n");
+}