feat(v1): add basic backend and frontend

frontend/src/lib/api.js

@@ -0,0 +1,42 @@
+const API_BASE = import.meta.env.VITE_API_BASE || "";
+
+async function parseResponse(response) {
+  const payload = await response.json().catch(() => ({}));
+  if (!response.ok) {
+    throw new Error(payload.detail || "Request failed");
+  }
+  return payload;
+}
+
+export async function uploadImage(file) {
+  const body = new FormData();
+  body.append("image", file);
+  const response = await fetch(`${API_BASE}/api/images/`, {
+    method: "POST",
+    body
+  });
+  return parseResponse(response);
+}
+
+export async function processImage(sessionId, operation, params) {
+  const response = await fetch(`${API_BASE}/api/process/`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ session_id: sessionId, operation, params })
+  });
+  return parseResponse(response);
+}
+
+export async function createBatch(operation, sessionIds, params = {}) {
+  const response = await fetch(`${API_BASE}/api/batch/`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ operation, session_ids: sessionIds, params })
+  });
+  return parseResponse(response);
+}
+
+export async function getJob(jobId) {
+  const response = await fetch(`${API_BASE}/api/jobs/${jobId}/`);
+  return parseResponse(response);
+}