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/__init__.py

@@ -1,6 +1,6 @@
 """
 Core Code API - OpenAPI-compatible functions for Open WebUI
 """
+from src.shared.config import __version__
 
-__version__ = "1.0.0"
 __author__ = "Core Code Team"