refactor(oi): improve data extraction and consolidate documentation

- Fix MQL5 API usage in EA to use correct CopyRates and POSITION_TYPE enums
- Refactor scraper data extraction to use drop_duplicates for unique strikes
- Consolidate Windows setup guide into main README
- Add virtual environment batch files for easier setup and execution
- Simplify run_scraper.bat to focus on core execution
- Normalize lot calculation to use SymbolInfo.LotsStep()

oi_scraper/run_scheduled.bat

@@ -0,0 +1,13 @@
+@echo off
+REM ==========================================
+REM CME OI Scraper - Scheduled Task Version
+REM For use with Windows Task Scheduler
+REM ==========================================
+
+REM Navigate to script directory
+cd /d %~dp0
+
+REM Activate virtual environment and run scraper (no pause)
+call venv\Scripts\activate.bat
+python main.py
+exit %ERRORLEVEL%