feat: add dashboard route, template, and styles for project and scenario insights

main.py

@@ -10,6 +10,7 @@ from models import (
     Scenario,
     SimulationParameter,
 )
+from routes.dashboard import router as dashboard_router
 from routes.projects import router as projects_router
 from routes.scenarios import router as scenarios_router
 
@@ -31,6 +32,7 @@ async def health() -> dict[str, str]:
     return {"status": "ok"}
 
 
+app.include_router(dashboard_router)
 app.include_router(projects_router)
 app.include_router(scenarios_router)