feat: add marketplace metrics, privacy features, and service registry endpoints

- Add Prometheus metrics for marketplace API throughput and error rates with new dashboard panels
- Implement confidential transaction models with encryption support and access control
- Add key management system with registration, rotation, and audit logging
- Create services and registry routers for service discovery and management
- Integrate ZK proof generation for privacy-preserving receipts
- Add metrics instru

tests/pytest.ini

@@ -0,0 +1,79 @@
+[tool:pytest]
+# pytest configuration for AITBC
+
+# Test discovery
+testpaths = tests
+python_files = test_*.py *_test.py
+python_classes = Test*
+python_functions = test_*
+
+# Path configuration
+addopts = 
+    --strict-markers
+    --strict-config
+    --verbose
+    --tb=short
+    --cov=apps
+    --cov=packages
+    --cov-report=html:htmlcov
+    --cov-report=term-missing
+    --cov-fail-under=80
+
+# Import paths
+import_paths = 
+    .
+    apps
+    packages
+
+# Markers
+markers =
+    unit: Unit tests (fast, isolated)
+    integration: Integration tests (require external services)
+    e2e: End-to-end tests (full system)
+    performance: Performance tests (measure speed/memory)
+    security: Security tests (vulnerability scanning)
+    slow: Slow tests (run separately)
+    gpu: Tests requiring GPU resources
+    confidential: Tests for confidential transactions
+    multitenant: Multi-tenancy specific tests
+
+# Minimum version
+minversion = 6.0
+
+# Test session configuration
+timeout = 300
+timeout_method = thread
+
+# Logging
+log_cli = true
+log_cli_level = INFO
+log_cli_format = %(asctime)s [%(levelname)8s] %(name)s: %(message)s
+log_cli_date_format = %Y-%m-%d %H:%M:%S
+
+# Warnings
+filterwarnings =
+    error
+    ignore::UserWarning
+    ignore::DeprecationWarning
+    ignore::PendingDeprecationWarning
+
+# Async configuration
+asyncio_mode = auto
+
+# Parallel execution
+# Uncomment to enable parallel testing (requires pytest-xdist)
+# addopts = -n auto
+
+# Custom configuration files
+ini_options =
+    markers = [
+        "unit: Unit tests",
+        "integration: Integration tests",
+        "e2e: End-to-end tests",
+        "performance: Performance tests",
+        "security: Security tests",
+        "slow: Slow tests",
+        "gpu: GPU tests",
+        "confidential: Confidential transaction tests",
+        "multitenant: Multi-tenancy tests"
+    ]