refactor: reorganize project structure — consolidate Docker files, clean root

- Delete temp files: _tmp_analysis.py, nul, dashboard_screenshot.png
- Move ea/ to archive/ea/ (deprecated)
- Move 12 Docker helper scripts (.bat/.sh) to docker/scripts/
- Move 5 Docker docs to docker/docs/
- Move .env.docker.example, requirements-docker.txt to docker/
- Update all scripts with cd to project root for correct path resolution
- Update all doc references to new paths
- Update .gitignore with bot.pid, bot_output.log, *.png patterns
- Update CLAUDE.md, README.md directory trees

Root reduced from ~40 files to 12 essential files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker/scripts/docker-remove-dashboard.bat

@@ -0,0 +1,35 @@
+@echo off
+REM Remove Dashboard & API while keeping database
+cd /d "%~dp0..\.."
+
+echo.
+echo ========================================
+echo Removing Dashboard & API Services
+echo ========================================
+echo.
+echo This will stop and remove:
+echo   - trading_bot_dashboard
+echo   - trading_bot_api
+echo.
+echo Database (trading_bot_db) will remain running.
+echo.
+pause
+
+echo Stopping services...
+docker-compose stop trading-api dashboard
+
+echo.
+echo Removing containers...
+docker-compose rm -f trading-api dashboard
+
+echo.
+echo ========================================
+echo Dashboard Removed!
+echo ========================================
+echo.
+echo Database is still running:
+docker ps --filter "name=trading_bot_db" --format "table {{.Names}}\t{{.Status}}"
+echo.
+echo To add dashboard back: docker\scripts\docker-add-dashboard.bat
+echo.
+pause