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>

config/database.go

@@ -40,6 +40,7 @@ type DatabaseInterface interface {
 	GetTraders(userID string) ([]*TraderRecord, error)
 	UpdateTraderStatus(userID, id string, isRunning bool) error
 	UpdateTrader(trader *TraderRecord) error
+	UpdateTraderInitialBalance(userID, id string, newBalance float64) error
 	UpdateTraderCustomPrompt(userID, id string, customPrompt string, overrideBase bool) error
 	DeleteTrader(userID, id string) error
 	GetTraderConfig(userID, traderID string) (*TraderRecord, *AIModelConfig, *ExchangeConfig, error)
@@ -899,6 +900,12 @@ func (d *Database) UpdateTraderCustomPrompt(userID, id string, customPrompt stri
 	return err
 }
 
+// UpdateTraderInitialBalance 更新交易员初始余额（用于自动同步交易所实际余额）
+func (d *Database) UpdateTraderInitialBalance(userID, id string, newBalance float64) error {
+	_, err := d.db.Exec(`UPDATE traders SET initial_balance = ? WHERE id = ? AND user_id = ?`, newBalance, id, userID)
+	return err
+}
+
 // DeleteTrader 删除交易员
 func (d *Database) DeleteTrader(userID, id string) error {
 	_, err := d.db.Exec(`DELETE FROM traders WHERE id = ? AND user_id = ?`, id, userID)
@@ -928,8 +935,13 @@ func (d *Database) GetTraderConfig(userID, traderID string) (*TraderRecord, *AIM
 	`, traderID, userID).Scan(
 		&trader.ID, &trader.UserID, &trader.Name, &trader.AIModelID, &trader.ExchangeID,
 		&trader.InitialBalance, &trader.ScanIntervalMinutes, &trader.IsRunning,
+		&trader.BTCETHLeverage, &trader.AltcoinLeverage, &trader.TradingSymbols,
+		&trader.UseCoinPool, &trader.UseOITop,
+		&trader.CustomPrompt, &trader.OverrideBasePrompt, &trader.SystemPromptTemplate,
+		&trader.IsCrossMargin,
 		&trader.CreatedAt, &trader.UpdatedAt,
 		&aiModel.ID, &aiModel.UserID, &aiModel.Name, &aiModel.Provider, &aiModel.Enabled, &aiModel.APIKey,
+		&aiModel.CustomAPIURL, &aiModel.CustomModelName,
 		&aiModel.CreatedAt, &aiModel.UpdatedAt,
 		&exchange.ID, &exchange.UserID, &exchange.Name, &exchange.Type, &exchange.Enabled,
 		&exchange.APIKey, &exchange.SecretKey, &exchange.Testnet,
@@ -1065,7 +1077,7 @@ func (d *Database) LoadBetaCodesFromFile(filePath string) error {
 			log.Printf("插入内测码 %s 失败: %v", code, err)
 			continue
 		}
-		
+
 		if rowsAffected, _ := result.RowsAffected(); rowsAffected > 0 {
 			insertedCount++
 		}