feat(ui): issuer form + admin mock (prototype)

docs/index.md

@@ -1 +1,45 @@
 # Prototype landing (UI will be added)
+<h2>Issuer Onboarding (Prototype)</h2>
+<form id="issuerForm" onsubmit="return validateIssuer()">
+  <label>Issuer Name* <input required id="issuer_name"></label><br>
+  <label>Product Name* <input required id="product_name"></label><br>
+  <label>Category* <input required id="category"></label><br>
+  <label>Certificate Type* <input required id="certificate_type"></label><br>
+  <label>Certificate ID* <input required id="certificate_id"></label><br>
+  <label>Region* <input required id="region"></label><br>
+  <label>Website/QR <input id="website_or_qr" placeholder="https://..."></label><br>
+  <button type="submit">Submit (Demo)</button>
+</form>
+
+<script>
+function validateIssuer(){
+  const req = ["issuer_name","product_name","category","certificate_type","certificate_id","region"];
+  for (const id of req){
+    const el = document.getElementById(id);
+    if(!el.value.trim()){
+      alert("Please fill " + id.replace("_"," "));
+      el.focus();
+      return false;
+    }
+  }
+  alert("Submission received (demo). Admin must approve.");
+  return false; // demo only
+}
+</script>
+
+<hr>
+
+<h2>Admin Panel (Mock)</h2>
+<table border="1" cellpadding="6">
+  <tr><th>Issuer</th><th>Status</th><th>Action</th></tr>
+  <tr><td>Sample Farm</td><td id="st1">Pending</td>
+      <td><button onclick="approve('st1')">Approve</button></td></tr>
+  <tr><td>Green Valley</td><td id="st2">Pending</td>
+      <td><button onclick="approve('st2')">Approve</button></td></tr>
+</table>
+
+<script>
+function approve(cellId){
+  document.getElementById(cellId).innerText = "Approved";
+}
+</script>