feat: Add minimal security analysis implementation for ECS MCP Server

[nzuresh]

Overview

This PR implements the foundational security analysis functionality for the ECS MCP Server. This is the first of multiple PRs that will incrementally build the complete security integration feature following a progressive development approach.

What's Included

• SecurityAnalyzer Module: Core security analysis logic with ECS-focused functionality
• API Endpoint: RESTful endpoint for security analysis with parameter validation
• Comprehensive Tests: Unit tests covering all functionality with 100% test coverage

Files Added/Modified

• src/ecs-mcp-server/awslabs/ecs_mcp_server/modules/security_analysis.py (76 lines) - Core security analyzer
• src/ecs-mcp-server/awslabs/ecs_mcp_server/api/security_analysis.py (88 lines) - API endpoint implementation
• src/ecs-mcp-server/tests/unit/test_security_analysis.py (170 lines) - Comprehensive unit tests

Total: 334 lines (progressive PR approach)

Validation Results

All quality checks pass:

• ✅ Ruff Format: All files properly formatted
• ✅ Ruff Check: No linting issues
• ✅ Tests: 9/9 tests pass (100% coverage)
• ✅ Size: 334 lines (manageable for review)
• ✅ Imports: All modules import successfully

Progressive Development Approach

This PR follows a progressive development methodology to ensure manageable code reviews:

1. PR feature: add continuous integration #1 (This PR): Minimal viable security analysis foundation
2. PR feat(security): add CODEOWNERS #2 (Next): Enhanced analysis features and additional security checks
3. PR feat(doc): update initial documentation #3 (Future): Integration with external security services
4. PR feat(doc): initial documentation #4 (Future): Advanced reporting and alerting capabilities

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

[nzuresh]

Closing it starting from Fresh