Inertia setup looks for host/templates/ but sm new writes templates/ at project root — boot fails

[antosubash]

Summary

sm new generates templates/index.html at the project root, but simple_module_hosting._inertia_setup only looks for <project_root>/host/templates. With the scaffold's default layout, the host has no usable template directory and boot fails with RuntimeError: Inertia not configured — no template directories available.

Reproduction

uvx --from simple_module_cli sm new my-app --db sqlite --preset standard -y --no-install
cd my-app
# (after working around #105/#106/#107)
make install
make migrate
uv run python -c "from main import app"

Boot output:

WARNING simple_module_hosting._inertia_setup: Host templates directory not found at /.../my-app/host/templates
WARNING simple_module_hosting._inertia_setup: No usable template directories — Inertia will fail to render views
...
File ".../site-packages/simple_module_hosting/app_builder.py", line 258, in create_app
 raise RuntimeError("Inertia not configured — no template directories available")
RuntimeError: Inertia not configured — no template directories available

Source reference

simple_module_hosting/_inertia_setup.py:35

host_templates = project_root / "host" / "templates"
...
if host_templates.is_dir():
 directories.append(host_templates)
else:
 logger.warning("Host templates directory not found at %s", host_templates)

Scaffold output (actual layout)

my-app/
├── client_app/
├── main.py
├── migrations/
├── templates/ ← scaffold writes here
│ └── index.html
└── ...

Suggested fix

One of:

1. Have sm new write the template to host/templates/index.html to match what the framework looks up.
2. Have _inertia_setup accept root templates/ as a fallback (less surprising to anyone reading the project layout — host/templates is an unusual location).
3. Make the host templates path configurable via SM_HOST_TEMPLATES_DIR and document it.

Workaround

mkdir -p host
mv templates host/templates

Environment

• simple_module_cli, simple_module_hosting 0.0.6
• macOS 25.4.0 (arm64), Python 3.12.10

[antosubash]

Fixed in 0.0.7 — Inertia setup boots without complaint on a fresh scaffold. The framework now finds the templates without the host/templates/ workaround.