fixed a bug on the config & now backend does use config values

docker/src/shared/config.js

@@ -55,18 +55,31 @@ export function getConfig() {
     };
 }
 
+function sanitizeLoadedConfig(loaded) {
+    return {
+        library: loaded.library,
+        paths: loaded.paths
+    };
+}
+
 export function setConfig(partialConfig) {
     ensureConfigFile();
 
-    const current = getConfig();
-    const next = deepMerge(current, partialConfig);
+    const raw = fs.readFileSync(CONFIG_PATH, 'utf8');
+    const loadedRaw = yaml.load(raw) || {};
+    const loaded = sanitizeLoadedConfig(loadedRaw);
 
-    fs.writeFileSync(
-        CONFIG_PATH,
-        yaml.dump(next),
-        'utf8'
+    const next = deepMerge(
+        structuredClone(DEFAULT_CONFIG),
+        deepMerge(loaded, partialConfig)
     );
 
+    const toSave = {
+        library: next.library,
+        paths: next.paths
+    };
+
+    fs.writeFileSync(CONFIG_PATH, yaml.dump(toSave), 'utf8');
     return next;
 }