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/definitions/mod.rs

@@ -3,7 +3,6 @@ use serde_json::Value;
 pub mod analytics;
 pub mod backtest;
 pub mod baseline;
-pub mod data;
 pub mod experts;
 pub mod optimization;
 pub mod reports;
@@ -52,10 +51,6 @@ pub fn get_tools_list() -> Value {
         setfiles::tool_describe_sweep(),
         setfiles::tool_list_set_files(),
         setfiles::tool_set_from_optimization(),
-        // Data Export (3 tools)
-        data::tool_export_ohlc(),
-        data::tool_export_ticks(),
-        data::tool_list_available_data(),
         // Reports (11 tools)
         reports::tool_list_reports(),
         reports::tool_search_reports(),