Add interactive onboarding process and update professional directory

Implements onboarding page, fixes login redirect, adds mock data to professional directory, and includes a screenshot asset.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 556aa286-edd2-4cea-8583-f4fc3cfd119b
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/81470e0d-8ae8-4335-9301-cd9a69e670fa/6009c02a-0a60-49de-bce6-3126cf528401.jpg

client/src/App.tsx

@@ -11,7 +11,7 @@ import LandingPage from "@/pages/LandingPage";
 import DashboardPage from "@/pages/DashboardPage";
 import LoginPage from "@/pages/LoginPage";
 import ProfessionalDirectory from "@/pages/ProfessionalDirectory";
-// import OnboardingPage from "@/pages/OnboardingPage";
+import OnboardingPage from "@/pages/OnboardingPage";
 import NotFound from "@/pages/not-found";
 
 function Router() {
@@ -20,6 +20,7 @@ function Router() {
       <Route path="/" component={LandingPage} />
       <Route path="/login" component={LoginPage} />
       <Route path="/register" component={LoginPage} />
+      <Route path="/onboarding" component={OnboardingPage} />
       <Route path="/dashboard" component={DashboardPage} />
       <Route path="/professionals" component={ProfessionalDirectory} />
       <Route component={NotFound} />