perf: add .dockerignore to reduce Docker image size

.dockerignore

@@ -0,0 +1,88 @@
+# Git
+.git
+.gitignore
+.gitattributes
+
+# Documentation
+*.md
+README.md
+LICENSE
+CHANGELOG.md
+
+# Development files
+.vscode
+.idea
+.DS_Store
+*.swp
+*.swo
+*~
+
+# Python
+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.Python
+*.so
+*.egg
+*.egg-info
+dist
+build
+.pytest_cache
+.coverage
+htmlcov
+
+# Node.js
+node_modules
+npm-debug.log
+yarn-error.log
+package-lock.json
+package.json
+
+# Test files
+test_*.py
+*_test.py
+tests/
+.pytest_cache/
+
+# Logs
+*.log
+cleanup_duplicates.log
+sync_missing_stocks.log
+
+# Temporary files
+*.tmp
+*.bak
+*.swp
+tmp/
+temp/
+
+# IDE
+.claude/
+
+# Documentation (all the MD files you created)
+AGENTIC_RAG_DEPLOYMENT.md
+ARCHITECTURE.md
+ARCHITECTURE_CLARIFICATION.md
+CLONE_TO_GITHUB.md
+CONTEXT_PROMPT_ENGINEERING.md
+COT_COMPARISON.md
+COT_IMPLEMENTATION.md
+DEPLOYMENT_GUIDE.md
+DEPLOYMENT_STATUS.md
+DEPLOY_ON_EXISTING_SERVER.md
+DEPLOY_VIA_GITHUB.md
+FINAL_DESIGN_SUMMARY.md
+FIXES_2025-10-19.md
+QUICK_START_V2.md
+TESTING_CHECKLIST.md
+TESTING_QUICK_REFERENCE.md
+TROUBLESHOOTING.md
+V2_PROMPT_UPDATES.md
+
+# Config for other platforms
+render.yaml
+nixpacks.toml
+
+# Status files
+update_status.json