feat(subscription): add membership access preflight

app/appconfig.py

@@ -122,6 +122,9 @@ DEFAULT_CONFIG = {
             "ratio": "1:1",
         },
     },
+    "subscription": {
+        "last_notice_id": "",
+    },
 }
 
 DEFAULT_AI_MODELS_CONFIG = {
@@ -706,6 +709,25 @@ def cdp_ready_timeout(config=None) -> int:
     return int(_config_or_load(config).get("cdp_ready_timeout", 60))
 
 
+def subscription_notice_id(config=None) -> str:
+    section = _config_or_load(config).get("subscription", {})
+    if not isinstance(section, dict):
+        return ""
+    return str(section.get("last_notice_id") or "").strip()
+
+
+def save_subscription_notice_id(notice_id, path=CONFIG_PATH) -> dict:
+    """Persist the last server notification version without storing credentials."""
+
+    config = load_config(path)
+    section = config.get("subscription", {})
+    if not isinstance(section, dict):
+        section = {}
+    section["last_notice_id"] = str(notice_id or "").strip()
+    config["subscription"] = section
+    return save_config(config, path=path)
+
+
 def ai_config(config=None) -> dict:
     return copy.deepcopy(_config_or_load(config).get("ai", DEFAULT_CONFIG["ai"]))