feat: enabling web-based OTA updates and deployment for frontend

Provider/frontend/src/lib/api.js

@@ -37,3 +37,39 @@ export async function reboot() {
     }
     return res.json();
 }
+
+/**
+ * Fetch OTA status from the ESP32.
+ * @returns {Promise<{active_slot: number, active_partition: string, target_partition: string}>}
+ */
+export async function getOTAStatus() {
+    const res = await fetch(`${API_BASE}/api/ota/status`);
+    if (!res.ok) {
+        throw new Error(`HTTP ${res.status}: ${res.statusText}`);
+    }
+    return res.json();
+}
+
+/**
+ * Upload a new frontend binary image.
+ * @param {File} file The binary file to upload.
+ * @returns {Promise<{status: string, message: string}>}
+ */
+export async function uploadOTAFrontend(file) {
+    const res = await fetch(`${API_BASE}/api/ota/frontend`, {
+        method: 'POST',
+        body: file, // Send the raw file Blob/Buffer
+        headers: {
+            // Let the browser set Content-Type for the binary payload, 
+            // or we could force application/octet-stream.
+            'Content-Type': 'application/octet-stream'
+        }
+    });
+    
+    if (!res.ok) {
+        const errorText = await res.text();
+        throw new Error(`Upload failed (${res.status}): ${errorText || res.statusText}`);
+    }
+    
+    return res.json();
+}