Add data export tools for OHLC and tick data

**New Tools:**
- export_ohlc: Export OHLC bar data from MT5 history to CSV/JSON
- export_ticks: Export tick data from MT5 tick database to CSV/JSON
- list_available_data: List available OHLC and tick data in MT5

**Implementation:**
- definitions/data.rs: Tool schemas for data export
- handlers/data.rs: Handlers that scan MT5 directories:
  - history/*.hst files (OHLC)
  - Tester/cache/* (cached data)
  - Bases/* (tick data)
- Provides guidance on how to export since MT5 uses proprietary binary formats
- Includes MQL5 script template for programmatic export

**Note:** MT5 uses proprietary .hst and .ticks binary formats.
Direct export requires MQL5 script using CopyRates()/CopyTicks().

src/tools/handlers/mod.rs

@@ -11,6 +11,7 @@ mod optimization;
 mod analysis;
 mod setfiles;
 mod reports;
+mod data;
 
 #[derive(Debug)]
 pub struct ToolHandler {
@@ -69,6 +70,11 @@ impl ToolHandler {
             "describe_sweep" => setfiles::handle_describe_sweep(args).await,
             "list_set_files" => setfiles::handle_list_set_files(&self.config).await,
             
+            // Data export handlers
+            "export_ohlc" => data::handle_export_ohlc(&self.config, args).await,
+            "export_ticks" => data::handle_export_ticks(&self.config, args).await,
+            "list_available_data" => data::handle_list_available_data(&self.config, args).await,
+            
             // Report handlers
             "get_latest_report" => reports::handle_get_latest_report(&self.config, args).await,
             "list_reports" => reports::handle_list_reports(args).await,