fix: frontend API endpoints trailing slashes and consistent error handling

frontend/src/lib/api.js

@@ -54,37 +54,48 @@ async function postApi(endpoint, body) {
 }
 // [/DEF:postApi]
 
+// [DEF:requestApi:Function]
+// @PURPOSE: Generic request wrapper.
+async function requestApi(endpoint, method = 'GET', body = null) {
+    try {
+        console.log(`[api.requestApi][Action] ${method} to context={{'endpoint': '${endpoint}'}}`);
+        const options = {
+            method,
+            headers: {
+                'Content-Type': 'application/json',
+            },
+        };
+        if (body) {
+            options.body = JSON.stringify(body);
+        }
+        const response = await fetch(`${API_BASE_URL}${endpoint}`, options);
+        if (!response.ok) {
+            const errorData = await response.json().catch(() => ({}));
+            throw new Error(errorData.detail || `API request failed with status ${response.status}`);
+        }
+        return await response.json();
+    } catch (error) {
+        console.error(`[api.requestApi][Coherence:Failed] Error ${method} to ${endpoint}:`, error);
+        addToast(error.message, 'error');
+        throw error;
+    }
+}
+
 // [DEF:api:Data]
 // @PURPOSE: API client object with specific methods.
 export const api = {
     getPlugins: () => fetchApi('/plugins/'),
     getTasks: () => fetchApi('/tasks/'),
     getTask: (taskId) => fetchApi(`/tasks/${taskId}`),
-    createTask: (pluginId, params) => postApi('/tasks', { plugin_id: pluginId, params }),
+    createTask: (pluginId, params) => postApi('/tasks/', { plugin_id: pluginId, params }),
     
     // Settings
-    getSettings: () => fetchApi('/settings'),
-    updateGlobalSettings: (settings) => {
-        return fetch(`${API_BASE_URL}/settings/global`, {
-            method: 'PATCH',
-            headers: { 'Content-Type': 'application/json' },
-            body: JSON.stringify(settings)
-        }).then(res => res.json());
-    },
+    getSettings: () => fetchApi('/settings/'),
+    updateGlobalSettings: (settings) => requestApi('/settings/global', 'PATCH', settings),
     getEnvironments: () => fetchApi('/settings/environments'),
     addEnvironment: (env) => postApi('/settings/environments', env),
-    updateEnvironment: (id, env) => {
-        return fetch(`${API_BASE_URL}/settings/environments/${id}`, {
-            method: 'PUT',
-            headers: { 'Content-Type': 'application/json' },
-            body: JSON.stringify(env)
-        }).then(res => res.json());
-    },
-    deleteEnvironment: (id) => {
-        return fetch(`${API_BASE_URL}/settings/environments/${id}`, {
-            method: 'DELETE'
-        }).then(res => res.json());
-    },
+    updateEnvironment: (id, env) => requestApi(`/settings/environments/${id}`, 'PUT', env),
+    deleteEnvironment: (id) => requestApi(`/settings/environments/${id}`, 'DELETE'),
     testEnvironmentConnection: (id) => postApi(`/settings/environments/${id}/test`, {}),
 };
 // [/DEF:api_module]