feat: add ReconConfig API and UI for managing configurations

- Added a new API endpoint for managing ReconConfigs at /api/configs, including GET, POST, PUT, and a test URL feature.
- Implemented a new configuration editor UI at /configs for creating and editing ReconConfigs.
- Introduced a new configs list page at /configs to display existing configurations with options to edit.
- Updated base HTML template to include a link to the new configs page.
- Created stub configuration and authentication models for workspace development.
- Added a stub configuration module to handle database configuration without a real database.

app/core/config.py

@@ -0,0 +1,29 @@
+"""Stub config module for the workspace.
+
+The production repo has a full config with database URLs and connection maps.
+This stub satisfies imports without a real database.
+"""
+from functools import lru_cache
+from os import getenv
+
+
+db_config_map = {
+    "NETREVEAL": "netreveal",
+    "DATAPRODUCT": "dataproduct",
+    "GROUPDW": "groupdw",
+    "SNOWFLAKE": "snowflake",
+}
+
+
+class DBConfig:
+    def __init__(self) -> None:
+        self.db_url = getenv("DATABASE_URL", "sqlite+aiosqlite:///./recon_ranger.db")
+
+
+@lru_cache
+def get_db_config() -> DBConfig:
+    return DBConfig()
+
+
+db_config = get_db_config()
+config = db_config