CLI main and RuntimeConfig cleanup. Added a session_ctx wrapper function for easier access and avoiding hostutil import in db.

paskia/util/runtime.py

@@ -0,0 +1,31 @@
+"""Runtime configuration utilities."""
+
+import os
+from functools import lru_cache
+
+import msgspec
+
+from paskia.db.structs import Config
+
+
+class RuntimeConfig(msgspec.Struct):
+    """Runtime configuration for the Paskia authentication server.
+
+    Wraps the db Config (CLI/stored settings) with computed runtime fields.
+    Serialized to PASKIA_CONFIG env var as JSON via msgspec.
+    """
+
+    config: Config  # CLI/stored configuration to persist
+    site_url: str  # Base URL without trailing path (e.g. https://example.com)
+    site_path: str  # Path to auth UI: "/" if auth_host, else "/auth/"
+    save: bool = False  # Whether to persist config to database
+
+
+@lru_cache(maxsize=1)
+def _load_config() -> "RuntimeConfig | None":
+    """Load RuntimeConfig from PASKIA_CONFIG env var."""
+    config_json = os.getenv("PASKIA_CONFIG")
+    if not config_json:
+        return None
+
+    return msgspec.json.decode(config_json.encode(), type=RuntimeConfig)