Baseline commit of the existing Maquina Comercial Pessoal project

Tracks the app that was already in place (capture, treatment, outreach,
WhatsApp integration, server, frontend, tests, docs) so future feature
work can branch and use isolated worktrees.

public/login.html

@@ -0,0 +1,35 @@
+<!doctype html>
+<html lang="pt-BR">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Máquina Comercial Pessoal - Login</title>
+<link rel="stylesheet" href="/css/app.css">
+<link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 64 64%22><rect width=%2264%22 height=%2264%22 rx=%2216%22 fill=%22%23f06a25%22/><text x=%2232%22 y=%2241%22 text-anchor=%22middle%22 font-family=%22Arial%22 font-size=%2226%22 font-weight=%22700%22 fill=%22white%22>MC</text></svg>">
+</head>
+<body class="login-body">
+
+<main class="login-wrap">
+  <form class="card login-card" id="form-login">
+    <div class="brand login-brand">
+      <span class="brand-mark brand-mark-lg brand-monogram" aria-hidden="true">MC</span>
+      <span class="brand-name">Máquina Comercial Pessoal</span>
+    </div>
+    <div class="field">
+      <label for="login-username">Usuário</label>
+      <input type="text" id="login-username" autocomplete="username" required>
+    </div>
+    <div class="field">
+      <label for="login-password">Senha</label>
+      <input type="password" id="login-password" autocomplete="current-password" required>
+    </div>
+    <p class="muted login-erro" id="login-erro"></p>
+    <button class="btn btn-primary btn-lg" type="submit">Entrar</button>
+  </form>
+</main>
+
+<div id="toast" class="toast hidden"></div>
+<script src="/js/api.js"></script>
+<script src="/js/login.js"></script>
+</body>
+</html>