feat: complete dev_tools module self-containment

Migrate dev_tools module to self-contained structure:

- routes/api/ - API endpoints
- models/architecture_scan.py - Architecture scan models
- models/test_run.py - Test run models
- schemas/ - Pydantic schemas
- services/ - Business logic services
- tasks/ - Celery background tasks
- exceptions.py - Module exceptions

Updated definition.py with self-contained paths.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/dev_tools/exceptions.py

@@ -0,0 +1,79 @@
+# app/modules/dev_tools/exceptions.py
+"""
+Dev-Tools Module Exceptions
+
+Module-specific exceptions for code quality and test runner functionality.
+Re-exports code quality exceptions from the legacy location and adds
+test runner specific exceptions.
+"""
+
+from app.exceptions.base import (
+    ExternalServiceException,
+    ResourceNotFoundException,
+)
+
+# Re-export code quality exceptions from legacy location
+# This avoids circular imports since app/exceptions/__init__.py imports code_quality.py
+from app.exceptions.code_quality import (
+    ViolationNotFoundException,
+    ScanNotFoundException,
+    ScanExecutionException,
+    ScanTimeoutException,
+    ScanParseException,
+    ViolationOperationException,
+    InvalidViolationStatusException,
+)
+
+
+# =============================================================================
+# Test Runner Exceptions (defined here as they don't exist in legacy location)
+# =============================================================================
+
+
+class TestRunNotFoundException(ResourceNotFoundException):
+    """Raised when a test run is not found."""
+
+    def __init__(self, run_id: int):
+        super().__init__(
+            resource_type="TestRun",
+            identifier=str(run_id),
+            error_code="TEST_RUN_NOT_FOUND",
+        )
+
+
+class TestExecutionException(ExternalServiceException):
+    """Raised when test execution fails."""
+
+    def __init__(self, reason: str):
+        super().__init__(
+            service_name="TestRunner",
+            message=f"Test execution failed: {reason}",
+            error_code="TEST_EXECUTION_FAILED",
+        )
+
+
+class TestTimeoutException(ExternalServiceException):
+    """Raised when test execution times out."""
+
+    def __init__(self, timeout_seconds: int = 3600):
+        super().__init__(
+            service_name="TestRunner",
+            message=f"Test execution timed out after {timeout_seconds} seconds",
+            error_code="TEST_TIMEOUT",
+        )
+
+
+__all__ = [
+    # Code quality exceptions (re-exported)
+    "ViolationNotFoundException",
+    "ScanNotFoundException",
+    "ScanExecutionException",
+    "ScanTimeoutException",
+    "ScanParseException",
+    "ViolationOperationException",
+    "InvalidViolationStatusException",
+    # Test runner exceptions (defined here)
+    "TestRunNotFoundException",
+    "TestExecutionException",
+    "TestTimeoutException",
+]