feat: add guided standalone setup flow

support.py

@@ -109,6 +109,31 @@ def load_sync_config() -> Dict[str, Any]:
     return normalize_config(copy.deepcopy(DEFAULT_CONFIG))
 
 
+def has_initialized_config() -> bool:
+    if not CONFIG_FILE.exists():
+        return False
+    try:
+        data = json.loads(CONFIG_FILE.read_text(encoding="utf-8"))
+    except Exception:
+        return False
+    if not isinstance(data, dict):
+        return False
+
+    proxy = str(data.get("proxy") or "").strip()
+    providers = data.get("mail_providers") or []
+    cpa_base_url = str(data.get("cpa_base_url") or "").strip()
+    base_url = str(data.get("base_url") or "").strip()
+    bearer_token = str(data.get("bearer_token") or "").strip()
+    email = str(data.get("email") or "").strip()
+    password = str(data.get("password") or "").strip()
+
+    provider_ready = isinstance(providers, list) and any(str(item).strip() for item in providers)
+    sub2api_ready = bool(base_url and (bearer_token or (email and password)))
+    cpa_ready = bool(cpa_base_url and str(data.get("cpa_token") or "").strip())
+
+    return bool(proxy and provider_ready) or sub2api_ready or cpa_ready
+
+
 def normalize_config(cfg: Dict[str, Any]) -> Dict[str, Any]:
     cfg = copy.deepcopy(cfg or {})
     legacy = str(cfg.get("mail_provider", "mailtm") or "mailtm").strip().lower()