Initial commit

Photo-based book cataloger with AI identification.
Room → Cabinet → Shelf → Book hierarchy; FastAPI + SQLite backend;
vanilla JS SPA; OpenAI-compatible plugin system for boundary
detection, text recognition, and archive search.

static/js/api.js

@@ -0,0 +1,23 @@
+/*
+ * api.js
+ * Single fetch wrapper used for all server communication.
+ * Throws an Error with the server's detail message on non-2xx responses.
+ *
+ * Provides: req(method, url, body?, isForm?)
+ * Depends on: nothing
+ */
+
+// ── API ──────────────────────────────────────────────────────────────────────
+async function req(method, url, body = null, isForm = false) {
+  const opts = {method};
+  if (body) {
+    if (isForm) { opts.body = body; }
+    else { opts.headers = {'Content-Type':'application/json'}; opts.body = JSON.stringify(body); }
+  }
+  const r = await fetch(url, opts);
+  if (!r.ok) {
+    const e = await r.json().catch(() => ({detail:'Request failed'}));
+    throw new Error(e.detail || 'Request failed');
+  }
+  return r.json();
+}