Remove non-functional data export tools

MT5 binaries (MetaEditor64.exe, metatester64.exe, terminal64.exe) are all
GUI applications with no command-line data export capability.

Removed:
- export_ohlc - Cannot read proprietary .hst binary format
- export_ticks - Cannot read proprietary .ticks binary format
- list_available_data - Only scanned directories, didn't export

Total tools: 46 → 43

Alternative for data export:
1. Use MT5 History Center GUI → Export
2. Create MQL5 script using CopyRates()/CopyTicks() → FileWrite
3. Run the MQL5 script inside MT5 terminal

src/tools/handlers/mod.rs

@@ -11,7 +11,6 @@ mod optimization;
 mod analysis;
 mod setfiles;
 mod reports;
-mod data;
 
 #[derive(Debug)]
 pub struct ToolHandler {
@@ -70,11 +69,6 @@ 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,