feat: fix YouTask peer enable + add Made by Galyaviev signature

- peer_enable: make PSK optional, only pass --client-preshared-key if non-empty
- peer_enable: strip /32 suffix from client_address before passing to wg-peerctl
- All pages: add "Made by Galyaviev" in Dancing Script handwritten font
- login.html: styled login page with signature below card
- base.html: signature in sidebar footer
- style.css: .made-by Dancing Script style

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

gui/app.py

@@ -563,11 +563,11 @@ def peer_enable(peer_id: int):
 
     name = item.get("name", "")
     pk = item.get("public_key", "")
-    addr = item.get("client_address", "")
+    addr = (item.get("client_address", "") or "").split("/")[0]  # strip /32 if present
     routes = item.get("advertised_routes", "") or ""
     psk = item.get("peer_psk", "") or ""
-    if not (name and pk and addr and psk):
-        flash("Недостаточно данных для включения peer (нужны name/public key/address/psk)", "error")
+    if not (name and pk):
+        flash("Недостаточно данных для включения peer", "error")
         return redirect(url_for("index"))
 
     cmd = [
@@ -575,10 +575,12 @@ def peer_enable(peer_id: int):
         "add",
         "--client-name", name,
         "--client-public-key", pk,
-        "--client-address", addr,
-        "--client-preshared-key", psk,
         "--persistent-keepalive", "25",
     ]
+    if addr:
+        cmd += ["--client-address", addr]
+    if psk:
+        cmd += ["--client-preshared-key", psk]
     if routes:
         cmd += ["--client-routes", routes]