feat: implement hybrid database architecture and frontend encryption

- Add PostgreSQL + SQLite hybrid database support with automatic switching
- Implement frontend AES-GCM + RSA-OAEP encryption for sensitive data
- Add comprehensive DatabaseInterface with all required methods
- Fix compilation issues with interface consistency
- Update all database method signatures to use DatabaseInterface
- Add missing UpdateTraderInitialBalance method to PostgreSQL implementation
- Integrate RSA public key distribution via /api/config endpoint
- Add frontend crypto service with proper error handling
- Support graceful degradation between encrypted and plaintext transmission
- Add directory creation for RSA keys and PEM parsing fixes
- Test both SQLite and PostgreSQL modes successfully
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: tinkle-community <tinklefund@gmail.com>

web/src/hooks/useSystemConfig.ts

@@ -1,29 +1,29 @@
-import { useEffect, useState } from 'react';
-import { getSystemConfig, type SystemConfig } from '../lib/config';
+import { useEffect, useState } from 'react'
+import { getSystemConfig, type SystemConfig } from '../lib/config'
 
 export function useSystemConfig() {
-  const [config, setConfig] = useState<SystemConfig | null>(null);
-  const [loading, setLoading] = useState(true);
-  const [error, setError] = useState<string | null>(null);
+  const [config, setConfig] = useState<SystemConfig | null>(null)
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<string | null>(null)
 
   useEffect(() => {
-    let mounted = true;
+    let mounted = true
     getSystemConfig()
       .then((data) => {
-        if (!mounted) return;
-        setConfig(data);
-        setLoading(false);
+        if (!mounted) return
+        setConfig(data)
+        setLoading(false)
       })
       .catch((err: Error) => {
-        if (!mounted) return;
-        console.error('Failed to fetch system config:', err);
-        setError(err.message);
-        setLoading(false);
-      });
+        if (!mounted) return
+        console.error('Failed to fetch system config:', err)
+        setError(err.message)
+        setLoading(false)
+      })
     return () => {
-      mounted = false;
-    };
-  }, []);
+      mounted = false
+    }
+  }, [])
 
-  return { config, loading, error };
-}
+  return { config, loading, error }
+}