feat: add standardized testing scripts and documentation

Add comprehensive suite of testing scripts for different workflows:
- test.sh: Interactive menu for all testing operations
- quick_test.sh: Fast unit test feedback (~10-30s)
- run_tests.sh: Main test runner with full configuration options
- coverage_report.sh: Coverage analysis with HTML/JSON/terminal reports
- ci_test.sh: CI/CD optimized testing with JUnit/coverage XML output

Features:
- Colored terminal output with clear error messages
- Consistent option flags across all scripts
- Support for test markers (unit, integration, e2e, slow, etc.)
- Parallel execution support
- Coverage thresholds (default: 85%)
- Virtual environment and dependency checks

Documentation:
- Update CLAUDE.md with testing section and examples
- Expand docs/developer/testing.md with comprehensive guide
- Add scripts/README.md with quick reference

All scripts are tested and executable. This standardizes the testing
process for local development, CI/CD, and pull request workflows.

scripts/README.md

@@ -0,0 +1,109 @@
+# AI-Trader Scripts
+
+This directory contains standardized scripts for testing, validation, and operations.
+
+## Testing Scripts
+
+### Interactive Testing
+
+**`test.sh`** - Interactive test menu
+```bash
+bash scripts/test.sh
+```
+User-friendly menu for all testing operations. Best for local development.
+
+### Development Testing
+
+**`quick_test.sh`** - Fast unit test feedback
+```bash
+bash scripts/quick_test.sh
+```
+- Runs unit tests only
+- No coverage
+- Fails fast
+- ~10-30 seconds
+
+**`run_tests.sh`** - Full test suite
+```bash
+bash scripts/run_tests.sh [OPTIONS]
+```
+- All test types (unit, integration, e2e)
+- Coverage reporting
+- Parallel execution support
+- Highly configurable
+
+**`coverage_report.sh`** - Coverage analysis
+```bash
+bash scripts/coverage_report.sh [OPTIONS]
+```
+- Generate HTML/JSON/terminal reports
+- Check coverage thresholds
+- Open reports in browser
+
+### CI/CD Testing
+
+**`ci_test.sh`** - CI-optimized testing
+```bash
+bash scripts/ci_test.sh [OPTIONS]
+```
+- JUnit XML output
+- Coverage XML for CI tools
+- Environment variable configuration
+- Excludes Docker tests
+
+## Validation Scripts
+
+**`validate_docker_build.sh`** - Docker build validation
+```bash
+bash scripts/validate_docker_build.sh
+```
+Validates Docker setup, build, and container startup.
+
+**`test_api_endpoints.sh`** - API endpoint testing
+```bash
+bash scripts/test_api_endpoints.sh
+```
+Tests all REST API endpoints with real simulations.
+
+## Other Scripts
+
+**`migrate_price_data.py`** - Data migration utility
+```bash
+python scripts/migrate_price_data.py
+```
+Migrates price data between formats.
+
+## Quick Reference
+
+| Task | Script | Command |
+|------|--------|---------|
+| Quick test | `quick_test.sh` | `bash scripts/quick_test.sh` |
+| Full test | `run_tests.sh` | `bash scripts/run_tests.sh` |
+| Coverage | `coverage_report.sh` | `bash scripts/coverage_report.sh -o` |
+| CI test | `ci_test.sh` | `bash scripts/ci_test.sh -f` |
+| Interactive | `test.sh` | `bash scripts/test.sh` |
+| Docker validation | `validate_docker_build.sh` | `bash scripts/validate_docker_build.sh` |
+| API testing | `test_api_endpoints.sh` | `bash scripts/test_api_endpoints.sh` |
+
+## Common Options
+
+Most test scripts support:
+- `-h, --help` - Show help
+- `-v, --verbose` - Verbose output
+- `-f, --fail-fast` - Stop on first failure
+- `-t, --type TYPE` - Test type (unit, integration, e2e, all)
+- `-m, --markers MARKERS` - Pytest markers
+- `-p, --parallel` - Parallel execution
+
+## Documentation
+
+For detailed usage, see:
+- [Testing Guide](../docs/developer/testing.md)
+- [Testing & Validation Guide](../TESTING_GUIDE.md)
+
+## Making Scripts Executable
+
+If scripts are not executable:
+```bash
+chmod +x scripts/*.sh
+```