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/refdata.py

@@ -1,7 +1,7 @@
 """Fake reference-data enums.
 
-The real `app.core.refdata` lives in the production repo. For this workspace
-we only need `ReconJobStatus` (consumed by `app.models.recon_job`).
+The real `app.core.refdata` lives in the production repo. This workspace
+extends it with the enums needed by the config editor.
 """
 from enum import Enum
 
@@ -12,3 +12,25 @@ class ReconJobStatus(str, Enum):
     COMPLETED = "completed"
     FAILED = "failed"
     CANCELLED = "cancelled"
+
+
+class ReconConfigStatus(str, Enum):
+    DRAFT = "draft"
+    PUBLISHED = "published"
+    ARCHIVED = "archived"
+
+
+class ReconPatterns(str, Enum):
+    ONE_TO_ONE = "one_to_one"
+    MANY_TO_ONE = "many_to_one"
+    ONE_TO_MANY = "one_to_many"
+    POSITIONAL = "positional"
+
+
+class ProfileFields(str, Enum):
+    ROW_COUNT = "row_count"
+    NULL_COUNT = "null_count"
+    DISTINCT_COUNT = "distinct_count"
+    SUM = "sum"
+    MIN = "min"
+    MAX = "max"