feat: add dashboard API with quick links and widgets

- Dashboard domain with Quick Links CRUD + reorder endpoints
- Dashboard widgets management endpoints
- Database migrations for quick_links and dashboard_widgets tables
- Static file controller for Organizr widgets
- Default local user when OIDC is disabled
- Domain-based architecture refactor (src/domains/, src/shared/)
- Test suite updated for new structure (285 tests passing)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/shared/security.py

@@ -0,0 +1,31 @@
+"""
+Security initialization module
+
+Handles OIDC configuration and authentication setup
+"""
+from src.shared.config import Settings
+from src.shared.logging import get_logger
+
+logger = get_logger(__name__)
+
+
+def initialize_oidc(settings: Settings) -> None:
+    """
+    Initialize OIDC authentication configuration
+
+    Args:
+        settings: Application settings containing OIDC configuration
+    """
+    # Import here to avoid circular imports
+    from src.auth.oidc import oidc_config
+
+    oidc_config.configure(
+        enabled=settings.oidc_enabled,
+        issuer=settings.oidc_issuer,
+        audience=settings.oidc_audience
+    )
+
+    if settings.oidc_enabled:
+        logger.info(f"OIDC authentication enabled (issuer: {settings.oidc_issuer})")
+    else:
+        logger.info("OIDC authentication disabled - API is publicly accessible")