Create a default account from PLAYER_USER/PLAYER_PASSWORD

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server.py

@@ -317,8 +317,18 @@ def serve(argv):
     ap.add_argument("--port", type=int, default=int(os.environ.get("PORT", 8080)))
     ap.add_argument("--host", default="0.0.0.0")
     a = ap.parse_args(argv)
-    if not read(F_USERS, {}):
-        sys.exit("No accounts yet. Run: python3 server.py adduser YOURNAME")
+    users = read(F_USERS, {})
+    du, dp = os.environ.get("PLAYER_USER", "").strip().lower(), os.environ.get("PLAYER_PASSWORD", "")
+    if du and dp and du not in users:  # default account for containers; never overwrites an existing one
+        users[du] = hash_pw(dp)
+        write(F_USERS, users, private=True)
+        if len(users) == 1 and os.path.exists(F_LEGACY):
+            legacy = read(F_LEGACY, {})
+            if legacy and all(isinstance(v, dict) and "pos" in v for v in legacy.values()):
+                write(F_PROGRESS, {du: legacy})
+        print(f"Created default account '{du}'.")
+    if not users:
+        sys.exit("No accounts yet. Run: python3 server.py adduser NAME (or set PLAYER_USER and PLAYER_PASSWORD)")
     if not oa_login()[0]:
         print("Note: no OpenAudible login set. Run `python3 server.py setup` or set OPENAUDIBLE_USER/OPENAUDIBLE_PASSWORD.")
     Handler.upstream = a.upstream.rstrip("/")