Single window models

[asmithml]

This PR adds support for single-window ML models and implements comprehensive model validation across the inference pipeline. The changes enable the API to handle both single-window and dual-window (temporal) models with proper validation and user guidance. Closes issues #48 #47 #46

Key Changes

Model Validation & Discovery

• Added model existence validation with helpful error messages referencing available models
• Implemented image count validation that ensures requests match model requirements (1 image for single-window, 2 for dual-window)
• Created new endpoints: GET /v1/models to list all models and GET /v1/models/{model_id} for detailed model information
• Enhanced request validation with @field_validator and @model_validator decorators

Single-Window Model Support

• Updated ML pipeline to handle optional win_b parameter for single-window models
• Modified download_images() and execute_inference_pipeline() to support both single and dual window modes
• Added conditional polygonization check - models that output GeoJSON directly skip polygonization step
• Updated inference service to determine window count based on model specifications

Testing & Type Safety

• Added comprehensive test suite (test_model_validation.py) with 163 new lines covering:
  • Model validation edge cases
  • Single vs dual-window model workflows
  • Model discovery endpoints
• Created reusable test fixtures for models, bboxes, and image URLs
• Re-enabled mypy type checking in CI pipeline
• Fixed all type checking issues and added mypy ignore rule for ftw_tools

Infrastructure Updates

• Changed dependency to ftw-tools[all]>=2.0.0b2 for complete feature set
• Fixed boto3 type hints to use types-aiobotocore-s3 instead of mypy-boto3-s3
• Updated project service to use .remove() instead of .set(None) for clearing progress field

Breaking Changes

None - all changes are backwards compatible with existing dual-window workflows.

Testing

• All existing tests pass
• Added 9 new test cases for model validation scenarios
• CI now runs mypy type checking on all application code