first implementation - image/drawing integration

backend/src/main/java/com/aiteacher/config/FigureStorageConfig.java

@@ -0,0 +1,25 @@
+package com.aiteacher.config;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+import java.nio.file.Paths;
+
+@Configuration
+public class FigureStorageConfig implements WebMvcConfigurer {
+
+    private final String basePath;
+
+    public FigureStorageConfig(@Value("${app.figure-storage.base-path:./uploads}") String basePath) {
+        this.basePath = Paths.get(basePath).toAbsolutePath().normalize().toString();
+    }
+
+    @Override
+    public void addResourceHandlers(ResourceHandlerRegistry registry) {
+        // Serve GET /api/v1/figures/** from the local file store
+        registry.addResourceHandler("/api/v1/figures/**")
+                .addResourceLocations("file:" + basePath + "/figures/");
+    }
+}