Implement initial application structure and UI.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 9111ef36-26c8-4085-84ca-a35dc1fec1b5
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/7083d608-d6d3-4a6a-9a27-6286c5109627/54918520-d42c-44cd-b4f4-9e5a42eb5be1.jpg

.replit

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+modules = ["nodejs-20", "bash", "web"]
+run = "npm run dev"
+hidden = [".config", ".git", "generated-icon.png", "node_modules", "dist"]
+
+[nix]
+channel = "stable-24_05"
+
+[deployment]
+deploymentTarget = "autoscale"
+run = ["npm", "run", "start"]
+build = ["npm", "run", "build"]
+
+[[ports]]
+localPort = 5000
+externalPort = 80
+
+[workflows]
+runButton = "Project"
+
+[[workflows.workflow]]
+name = "Project"
+mode = "parallel"
+author = "agent"
+
+[[workflows.workflow.tasks]]
+task = "workflow.run"
+args = "Start application"
+
+[[workflows.workflow]]
+name = "Start application"
+author = "agent"
+
+[workflows.workflow.metadata]
+agentRequireRestartOnSave = false
+
+[[workflows.workflow.tasks]]
+task = "packager.installForAll"
+
+[[workflows.workflow.tasks]]
+task = "shell.exec"
+args = "npm run dev"
+waitForPort = 5000