feat: add get_active_account and 8 new utility tools

High Priority Tools:
- check_symbol_data_status: validate symbol history data availability
- get_backtest_history: list all backtest results for EA/symbol
- compare_backtests: side-by-side comparison of multiple backtests

Medium Priority Tools:
- init_project: scaffold new MQL5 project with templates (scalper/swing/grid)
- validate_ea_syntax: pre-compile syntax checking
- check_mt5_status: check MT5 terminal readiness

Low Priority Tools:
- create_set_template: generate .set files from EA inputs
- export_report: export reports to CSV/JSON/Markdown

Other Changes:
- Consolidate config into src/models/config.rs, delete src/config.rs
- Add CurrentAccount with UTF-16LE parsing for common.ini
- Add BacktestPreflight struct for pre-flight checks
- Update backtest handler with active account context
- Update list_symbols to filter by active server

Total tools: 57

src/tools/definitions/mod.rs

@@ -8,6 +8,7 @@ pub mod optimization;
 pub mod reports;
 pub mod setfiles;
 pub mod system;
+pub mod utility;
 
 pub fn get_tools_list() -> Value {
     let tools = vec![
@@ -38,10 +39,25 @@ pub fn get_tools_list() -> Value {
         experts::tool_list_experts(),
         experts::tool_list_indicators(),
         experts::tool_list_scripts(),
+        experts::tool_search_experts(),
+        experts::tool_search_indicators(),
+        experts::tool_search_scripts(),
+        experts::tool_copy_indicator_to_project(),
+        experts::tool_copy_script_to_project(),
         // System
         system::tool_verify_setup(),
         system::tool_list_symbols(),
         system::tool_healthcheck(),
+        system::tool_get_active_account(),
+        // Utility (8 tools)
+        utility::tool_check_symbol_data_status(),
+        utility::tool_get_backtest_history(),
+        utility::tool_compare_backtests(),
+        utility::tool_init_project(),
+        utility::tool_validate_ea_syntax(),
+        utility::tool_check_mt5_status(),
+        utility::tool_create_set_template(),
+        utility::tool_export_report(),
         // Set Files
         setfiles::tool_read_set_file(),
         setfiles::tool_write_set_file(),