feat: add base template with Pico CSS dark theme and home page

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/routes/pages.py

@@ -0,0 +1,23 @@
+"""Page routes for serving full HTML pages.
+
+Renders Jinja2 templates for user-facing pages.
+"""
+
+from fastapi import APIRouter, Request
+from fastapi.responses import HTMLResponse
+
+router = APIRouter(tags=["pages"])
+
+
+@router.get("/")
+async def home_page(request: Request) -> HTMLResponse:
+    """Render the home page.
+
+    Args:
+        request: The incoming HTTP request.
+
+    Returns:
+        Rendered home page HTML.
+    """
+    templates = request.app.state.templates
+    return templates.TemplateResponse(request, "pages/home.html")