feat: implement comprehensive configuration management system with web interface and database support

docs/architecture/current-implementation.md

@@ -9,6 +9,20 @@ This document summarizes the code that exists now, not the original plan.
 - DuckDB is initialized and migrated on startup.
 - Runtime recovery persists and restores control state and snapshots.
 
+## Configuration Management
+
+- Complete configuration management system implemented with database-backed user settings.
+- Configuration service in [src/arbitrade/config/service.py](../../src/arbitrade/config/service.py) handles loading and applying settings.
+- Repository classes in [src/arbitrade/storage/repositories.py](../../src/arbitrade/storage/repositories.py) provide database access.
+- Web UI for configuration at `/dashboard/config/` with CRUD operations for:
+  - Currency pairings
+  - Fee configurations
+  - Application settings
+  - Backtesting parameters
+- Hot-reloading capabilities for runtime configuration changes.
+- Input validation and error handling for all configuration forms.
+- Audit logging for all configuration modifications.
+
 ## Market Data and Detection
 
 - Kraken market data is handled by native WS and thin REST code.