Fix worker removal and improve web UI defaults

- Parse optional http:// scheme prefix on worker specs so a scheme-typed
  IP is stored cleanly and its remove button works.
- Delete workers by their stored DB host/port instead of re-parsing the
  rendered URL, and surface add/remove errors in the UI.
- Default new builds to git URL instead of zip upload.
- Show worker hostname/IP from agent status in the address column.
- Always include DB host/port in worker API output.

ctrl/static/app.js

@@ -63,7 +63,8 @@ async function refreshWorkers() {
     box.innerHTML = `<table>
       <tr><th>Address</th><th>Status</th><th>OS / CPU</th><th></th></tr>` +
       workers.map((w) => {
-        const addr = `${w.host || ""}:${w.port || ""}`;
+        const displayHost = w.online ? (w.hostname || w.ip || w.host) : w.host;
+        const addr = `${esc(displayHost)}:${esc(w.port || "")}`;
         const status = w.online
           ? `<span class="badge done">ready · ${esc(w.status || "ok")}</span>`
           : `<span class="badge failed">down</span>`;
@@ -72,7 +73,7 @@ async function refreshWorkers() {
           <td><code>${esc(addr)}</code></td>
           <td>${status}</td>
           <td>${osCpu}</td>
-          <td><button class="remove-worker" data-url="${esc(w.url)}">Remove</button></td>
+          <td><button class="remove-worker" data-host="${esc(w.host)}" data-port="${esc(w.port)}">Remove</button></td>
         </tr>`;
       }).join("") + `</table>`;
   } catch (_) {
@@ -85,6 +86,7 @@ $("#worker-form").addEventListener("submit", async (e) => {
   const input = $("#worker-spec");
   const spec = input.value.trim();
   if (!spec) return;
+  const msg = $("#worker-msg");
   try {
     const resp = await fetch("/api/workers", {
       method: "POST",
@@ -94,25 +96,35 @@ $("#worker-form").addEventListener("submit", async (e) => {
     const data = await resp.json().catch(() => ({}));
     if (!resp.ok) throw new Error(data.error || resp.statusText);
     input.value = "";
+    msg.textContent = `Added worker ${spec}`;
+    msg.className = "msg";
     refreshWorkers();
     refreshCapabilities();
   } catch (err) {
-    $("#worker-spec").value = "";
-    $("#worker-spec").placeholder = `Error: ${err.message}`;
+    input.value = "";
+    msg.textContent = `Error: ${err.message}`;
+    msg.className = "msg error";
   }
 });
 
 $("#workers").addEventListener("click", async (e) => {
   const btn = e.target.closest("button.remove-worker");
   if (!btn) return;
-  const url = btn.dataset.url;
-  const host = url.replace(/^https?:\/\//, "").split(":")[0];
-  const port = url.replace(/^https?:\/\//, "").split(":")[1];
+  const msg = $("#worker-msg");
+  const host = btn.dataset.host;
+  const port = btn.dataset.port;
   try {
-    await fetch(`/api/workers/${encodeURIComponent(port)}/${encodeURIComponent(host)}`, { method: "DELETE" });
+    const resp = await fetch(`/api/workers/${encodeURIComponent(port)}/${encodeURIComponent(host)}`, { method: "DELETE" });
+    const data = await resp.json().catch(() => ({}));
+    if (!resp.ok) throw new Error(data.error || resp.statusText);
+    msg.textContent = `Removed ${host}:${port}`;
+    msg.className = "msg";
     refreshWorkers();
     refreshCapabilities();
-  } catch (_) {}
+  } catch (err) {
+    msg.textContent = `Remove failed: ${err.message}`;
+    msg.className = "msg error";
+  }
 });
 
 async function refreshJobs() {

ctrl/static/index.html

@@ -19,6 +19,7 @@
         <input type="text" id="worker-spec" placeholder="host:port (e.g. 192.168.1.40:9001)">
         <button type="submit">Add worker</button>
       </form>
+      <p id="worker-msg" class="msg"></p>
       <div id="workers"></div>
     </section>
 
@@ -28,18 +29,18 @@
         <div class="field">
           <label for="mode">Source</label>
           <select id="mode">
-            <option value="upload">Upload zip</option>
             <option value="git">Git repo</option>
+            <option value="upload">Upload zip</option>
           </select>
         </div>
-        <div class="field" id="upload-field">
-          <label for="file">Project zip</label>
-          <input type="file" id="file" accept=".zip">
-        </div>
-        <div class="field" id="url-field" hidden>
+        <div class="field" id="url-field">
           <label for="url">Git URL</label>
           <input type="text" id="url" placeholder="https://…">
         </div>
+        <div class="field" id="upload-field" hidden>
+          <label for="file">Project zip</label>
+          <input type="file" id="file" accept=".zip">
+        </div>
         <div class="fields-row">
           <div class="field">
             <label for="os">OS</label>