Carry over pre-existing WABA outreach automation WIP

This work already existed uncommitted in the main working tree (not
authored by this branch) and is required as a runtime dependency for the
campaign outreach port (zpro-client, templates, outreach routes/UI). Copied
in as-is, untouched, so this feature branch has a working baseline; the
original uncommitted state in the main checkout is left exactly as it was.

public/login.html

@@ -5,21 +5,23 @@
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>GTI Máquina Comercial — Login</title>
 <link rel="stylesheet" href="/css/app.css">
-<link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>🎯</text></svg>">
+<link rel="icon" href="/img/logo-gti.png">
 </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">GTI</span>
+      <img class="brand-mark brand-mark-lg" src="/img/logo-gti.png" alt="GTI">
       <span class="brand-name">Máquina Comercial</span>
     </div>
     <div class="field">
-      <label>Usuário <input type="text" id="login-username" autocomplete="username" required></label>
+      <label for="login-username">Usuário</label>
+      <input type="text" id="login-username" autocomplete="username" required>
     </div>
     <div class="field">
-      <label>Senha <input type="password" id="login-password" autocomplete="current-password" required></label>
+      <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>