Add Nocturne debug web UI, core process control, and web QR login

poc/public/api.js

@@ -0,0 +1,61 @@
+"use strict";
+
+window.VK = window.VK ?? {};
+
+const bus = new Map();
+
+window.VK.bus = {
+    on(type, handler) {
+        const handlers = bus.get(type) ?? new Set();
+        handlers.add(handler);
+        bus.set(type, handlers);
+        return () => handlers.delete(handler);
+    },
+    emit(type, payload) {
+        for (const handler of bus.get(type) ?? []) {
+            try {
+                handler(payload);
+            } catch (error) {
+                console.error(`[bus] ${type} handler failed`, error);
+            }
+        }
+    }
+};
+
+async function request(path, options) {
+    const response = await fetch(path, options);
+    let body;
+    try {
+        body = await response.json();
+    } catch {
+        throw new Error(`request failed (${response.status})`);
+    }
+    if (!body.ok) throw new Error(body.error ?? `request failed (${response.status})`);
+    return body.result;
+}
+
+window.VK.api = {
+    get: path => request(path),
+    post: (path, data) =>
+        request(path, {
+            method: "POST",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify(data ?? {})
+        })
+};
+
+window.VK.connectEvents = function connectEvents() {
+    const source = new EventSource("/api/events");
+
+    source.onmessage = message => {
+        let data;
+        try {
+            data = JSON.parse(message.data);
+        } catch {
+            return;
+        }
+        window.VK.bus.emit("event", data);
+    };
+
+    source.onerror = () => window.VK.bus.emit("sse-error");
+};