feat(branding): nama PT dapat diatur di Pengaturan

- field company_subheader di Info Aplikasi
- dipakai sebagai kop invoice/PDF (sudah ada) dan menggantikan baris footer bila diisi
- default kosong: footer tetap 'Made with <heart> from Oxpoe in INA.'

views/admin/settings.ejs

@@ -269,6 +269,11 @@
             <label class="fl"><%= t('admin.settings.company_name', 'Nama Aplikasi / Perusahaan') %></label>
             <input class="fc" name="company_header" value="<%= settings.company_header || '' %>">
           </div>
+          <div class="fg">
+            <label class="fl">Nama PT / Sub-header (kop invoice &amp; PDF)</label>
+            <input class="fc" name="company_subheader" value="<%= settings.company_subheader || '' %>" placeholder="Contoh: PT Nama Perusahaan">
+            <div style="font-size:10px;color:var(--muted);margin-top:4px">Dipakai pada kop invoice/PDF. Bisa berbeda tiap instalasi.</div>
+          </div>
           <div class="fg">
             <label class="fl"><%= t('admin.set.public_url','URL Publik Aplikasi (Public Base URL)') %></label>
             <input class="fc" name="public_base_url" value="<%= settings.public_base_url || '' %>" placeholder="https://portal.domain-anda.com">

views/landing.ejs

@@ -315,7 +315,7 @@
         </a>
         <p class="muted" style="font-size:14px;max-width:40ch"><%= t('landing.footer.tagline','Micro Internet Provider dan Server Platform.') %></p>
         <p class="muted" style="font-size:13px;margin-top:8px;max-width:40ch">Internet Freedom — We Are Open-Source.</p>
-        <p class="muted" style="font-size:12.5px;margin-top:12px">Made with <i class="bi bi-heart-fill" style="color:#e5484d"></i> from Oxpoe in INA.</p>
+        <p class="muted" style="font-size:12.5px;margin-top:12px"><% if (typeof settings !== 'undefined' && settings && settings.company_subheader) { %><%= settings.company_subheader %><% } else { %>Made with <i class="bi bi-heart-fill" style="color:#e5484d"></i> from Oxpoe in INA.<% } %></p>
       </div>
       <div>
         <h4><%= t('landing.footer.nav','Navigasi') %></h4>

views/login.ejs

@@ -205,7 +205,7 @@
         </a>
         <p class="muted" style="font-size:14px;max-width:40ch">Micro Internet Provider dan Server Platform.</p>
         <p class="muted" style="font-size:13px;margin-top:8px">Internet Freedom — We Are Open-Source.</p>
-        <p class="muted" style="font-size:12.5px;margin-top:12px">Made with <i class="bi bi-heart-fill" style="color:#e5484d"></i> from Oxpoe in INA.</p>
+        <p class="muted" style="font-size:12.5px;margin-top:12px"><% if (typeof settings !== 'undefined' && settings && settings.company_subheader) { %><%= settings.company_subheader %><% } else { %>Made with <i class="bi bi-heart-fill" style="color:#e5484d"></i> from Oxpoe in INA.<% } %></p>
       </div>
       <div>
         <h4>Portal</h4>