Make jinja2 optional - remove from core dependencies

- Remove jinja2 from pyproject.toml dependencies
- Make Jinja2 backend optional with ImportError handling
- Simplify home app - return JSON instead of templates
- Remove templates directory from project template
- Make render_template require jinja2 installation
- Add fallback string replacement in template rendering

Author: ForceFledgling

pyproject.toml

@@ -10,7 +10,6 @@ dependencies = [
     "uvicorn>=0.15.0",
     "starlette>=0.27.0",
     "asgiref>=3.0.0",
-    "jinja2>=2.10.0",
     "python-multipart>=0.0.5",
     "sqlalchemy>=1.4.0,<2.0.0",
     "alembic>=1.8.0",

…/conf/app_template_async/__init__.py-tpl …ystack/conf/app_template/__init__.py-tplsrc/raystack/conf/app_template_async/__init__.py-tpl renamed to src/raystack/conf/app_template/__init__.py-tpl src/raystack/conf/app_template_async/__init__.py-tpl renamed to src/raystack/conf/app_template/__init__.py-tpl

@@ -0,0 +1 @@
+# Register your models here.

src/raystack/conf/app_template/admin.py-tpl

@@ -0,0 +1,6 @@
+from raystack.compat import JSONResponse
+
+# Create your views here.
+
+def example_view(request):
+    return JSONResponse({"message": "Example view"})