style: Implement server-side turtle actions for movement and block manipulation

client/src/store/turtleStore.js

@@ -288,6 +288,37 @@ export const useTurtleStore = create((set, get) => ({
     }
   },
 
+  // ========== Server-Side Movement & Actions ==========
+  // All movement/actions are routed through the server's Turtle.js exec() pipeline
+
+  _turtleAction: async (turtleId, action, body = {}) => {
+    try {
+      const response = await fetch(`${API_URL}/turtle/${turtleId}/${action}`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(body)
+      });
+      return await response.json();
+    } catch (error) {
+      console.error(`  ❌ Error ${action}:`, error);
+      return { success: false, error: error.message };
+    }
+  },
+
+  moveForward: async (turtleId) => get()._turtleAction(turtleId, 'forward'),
+  moveBack: async (turtleId) => get()._turtleAction(turtleId, 'back'),
+  moveUp: async (turtleId) => get()._turtleAction(turtleId, 'up'),
+  moveDown: async (turtleId) => get()._turtleAction(turtleId, 'down'),
+  turnLeft: async (turtleId) => get()._turtleAction(turtleId, 'turnLeft'),
+  turnRight: async (turtleId) => get()._turtleAction(turtleId, 'turnRight'),
+  digBlock: async (turtleId) => get()._turtleAction(turtleId, 'dig'),
+  digBlockUp: async (turtleId) => get()._turtleAction(turtleId, 'digUp'),
+  digBlockDown: async (turtleId) => get()._turtleAction(turtleId, 'digDown'),
+  placeBlock: async (turtleId, text) => get()._turtleAction(turtleId, 'place', { text }),
+  placeBlockUp: async (turtleId, text) => get()._turtleAction(turtleId, 'placeUp', { text }),
+  placeBlockDown: async (turtleId, text) => get()._turtleAction(turtleId, 'placeDown', { text }),
+  refuelTurtle: async (turtleId, count) => get()._turtleAction(turtleId, 'refuel-action', { count }),
+
   // Fetch chunk analyses from server
   fetchChunkAnalyses: async () => {
     try {