feat(gui): inline peer rename

Click on peer name in the table to edit it inline.
Enter to save, Escape to cancel, blur also saves.
Saved via POST /peers/<id>/rename without page reload.

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

gui/app.py

@@ -625,6 +625,19 @@ def peer_delete_by_key():
     return redirect(url_for("index"))
 
 
+@app.post("/peers/<int:peer_id>/rename")
+def peer_rename(peer_id: int):
+    name = (request.form.get("name") or "").strip()
+    if not name:
+        flash("Имя не может быть пустым", "error")
+        return redirect(url_for("index"))
+    with db_conn() as conn:
+        cur = conn.cursor()
+        cur.execute("UPDATE peers SET name=? WHERE id=?", (name, peer_id))
+        conn.commit()
+    return ("", 204)
+
+
 @app.route("/scripts")
 def scripts():
     commands = {