Apache reverse proxy for webapp, UI improvements

- Move Flask to localhost:9010, Apache serves port 9009 with static file
  handling and reverse proxy to fix intermittent asset loading on remote clients
- Add "PXE Manager" branding beneath logo in sidebar
- Increase code editor size (startnet.cmd and unattend XML) to 70vh
- Add test-lab.sh for full lab VM testing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

webapp/app.py

@@ -958,4 +958,4 @@ def inject_globals():
 # ---------------------------------------------------------------------------
 
 if __name__ == "__main__":
-    app.run(host="0.0.0.0", port=9009, debug=False)
+    app.run(host="127.0.0.1", port=9010, debug=False, threaded=True)

webapp/templates/base.html

@@ -55,8 +55,9 @@
       color: #fff;
       border-bottom: 1px solid rgba(255,255,255,0.08);
       display: flex;
+      flex-direction: column;
       align-items: center;
-      gap: 0.5rem;
+      gap: 0.3rem;
     }
     .sidebar .brand .bi {
       font-size: 1.3rem;

webapp/templates/startnet_editor.html

@@ -6,7 +6,9 @@
   .cmd-editor {
     font-family: 'Consolas', 'Courier New', monospace;
     font-size: 0.9rem;
-    min-height: 400px;
+    min-height: 600px;
+    height: 70vh;
+    resize: vertical;
     background-color: #1e1e1e;
     color: #d4d4d4;
     border: 1px solid #333;

webapp/templates/unattend_editor.html

@@ -16,7 +16,8 @@
   .raw-xml-editor {
     font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
     font-size: 0.85rem;
-    min-height: 500px;
+    min-height: 600px;
+    height: 70vh;
     tab-size: 2;
     white-space: pre;
     resize: vertical;