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.

pyproject.toml

@@ -40,9 +40,9 @@ dev = [
 ]
 
 [project.scripts]
-py-dvt-ate = "py_dvt_ate.cli.main:app"
-py-dvt-ate-server = "py_dvt_ate.server.main:main"
-py-dvt-ate-dashboard = "py_dvt_ate.dashboard.app:main"
+py-dvt-ate = "py_dvt_ate.app.cli:app"
+py-dvt-ate-server = "py_dvt_ate.simulation.server:main"
+py-dvt-ate-dashboard = "py_dvt_ate.app.dashboard.app:main"
 
 [build-system]
 requires = ["hatchling"]