Restructure package for domain-driven design

Reorganise package structure to improve separation of concerns:
- instruments/ - SCPI, transport, drivers, interfaces, factory
- simulation/ - physics engine, virtual instruments, server
- framework/ - test runner, logger, limits, context
- tests/ - thermal/, electrical/ (DVT test implementations)
- data/ - repository, models
- reporting/ - generator, templates
- app/ - CLI, config, dashboard

This structure enables:
- Reusable instruments package for other test suites
- Clear separation of simulation (dev) vs production code
- Domain-focused package organisation

Updated documentation to reflect new paths.

src/py_dvt_ate/app/__init__.py

@@ -0,0 +1,5 @@
+"""Application entry points.
+
+Contains CLI, dashboard, and configuration loading for the
+py_dvt_ate application.
+"""

src/py_dvt_ate/app/cli.py

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+"""Command-line interface for py_dvt_ate."""
+
+from typing import Annotated, Optional
+
+import typer
+
+from py_dvt_ate import __version__
+
+app = typer.Typer(
+    name="py-dvt-ate",
+    help="Coupled Physics DVT Simulation Platform",
+    add_completion=False,
+)
+
+
+def version_callback(value: bool) -> None:
+    """Print version and exit."""
+    if value:
+        typer.echo(f"py-dvt-ate version {__version__}")
+        raise typer.Exit()
+
+
+@app.callback()
+def main(
+    version: Annotated[
+        Optional[bool],
+        typer.Option(
+            "--version",
+            "-v",
+            help="Show version and exit.",
+            callback=version_callback,
+            is_eager=True,
+        ),
+    ] = None,
+) -> None:
+    """py-dvt-ate: Coupled Physics DVT Simulation Platform."""
+
+
+if __name__ == "__main__":
+    app()

src/py_dvt_ate/app/dashboard/__init__.py

@@ -0,0 +1,5 @@
+"""Streamlit dashboard for real-time monitoring.
+
+Provides visualisation of instrument status, test progress,
+and historical results.
+"""