Initial commit: Nerd Monitor - Cross-platform system monitoring application

Features:
- Multi-platform agents (Linux, macOS, Windows - AMD64 & ARM64)
- Real-time CPU, RAM, and disk usage monitoring
- Responsive web dashboard with live status indicators
- Session-based authentication with secure credentials
- Stale agent detection and removal (6+ months inactive)
- Auto-refresh dashboard (5 second intervals)
- 15-second agent reporting intervals
- Auto-generated agent IDs from hostnames
- In-memory storage (zero database setup)
- Minimal dependencies (Chi router + Templ templating)

Project Structure:
- cmd/: Agent and Server executables
- internal/: API, Auth, Stats, Storage, and UI packages
- views/: Templ templates for dashboard UI
- Makefile: Build automation for all platforms

Ready for deployment with comprehensive documentation:
- README.md: Full project documentation
- QUICKSTART.md: Getting started guide
- AGENTS.md: Development guidelines

views/dashboard.templ

@@ -0,0 +1,81 @@
+package views
+
+import (
+	"nerd-monitor/internal/store"
+)
+
+templ Dashboard(agents []*store.AgentStats, staleAgents []*store.AgentStats) {
+	@BaseLayout("Dashboard", dashboardContent(agents, staleAgents))
+}
+
+templ dashboardContent(agents []*store.AgentStats, staleAgents []*store.AgentStats) {
+	<h2 style="margin-bottom: 1rem;">Agent Status Overview</h2>
+	
+	@StaleAgentAlert(len(staleAgents), nil)
+	
+	if len(agents) == 0 {
+		<div class="alert alert-info">
+			<strong>ℹ️ No agents connected</strong>
+			<p style="margin-top: 0.5rem; font-size: 0.875rem;">
+				Start an agent to see its statistics appear here.
+			</p>
+		</div>
+	} else {
+		<div class="card">
+			<div class="card-title">Active Agents</div>
+			<table>
+				<thead>
+					<tr>
+						<th>Hostname</th>
+						<th>CPU Usage</th>
+						<th>Memory</th>
+						<th>Disk</th>
+						<th>Last Seen</th>
+					</tr>
+				</thead>
+				<tbody>
+					for _, agent := range agents {
+						@AgentRow(agent.ID, agent.Hostname, agent.CPUUsage, agent.RAMUsage, agent.RAMTotal, agent.DiskUsage, agent.DiskTotal, agent.LastSeen)
+					}
+				</tbody>
+			</table>
+		</div>
+	}
+	
+	if len(staleAgents) > 0 {
+		<div class="card" style="margin-top: 2rem; border-color: #d97706;">
+			<div class="card-title" style="color: #f59e0b;">
+				Stale Agents ({ len(staleAgents) })
+			</div>
+			<form method="POST" action="/api/agents/remove-stale" style="margin-top: 1rem;">
+				<table>
+					<thead>
+						<tr>
+							<th style="width: 30px;"><input type="checkbox" id="select-all" onchange="toggleAll(this)" /></th>
+							<th>Hostname</th>
+							<th>Last Seen</th>
+						</tr>
+					</thead>
+					<tbody>
+						for _, agent := range staleAgents {
+							<tr>
+								<td><input type="checkbox" name="agent_ids" value={ agent.ID } class="agent-checkbox" /></td>
+								<td>{ agent.Hostname }</td>
+								<td class="timestamp">{ FormatTime(agent.LastSeen) }</td>
+							</tr>
+						}
+					</tbody>
+				</table>
+				<div class="btn-group">
+					<button type="submit" class="btn btn-danger" style="margin-top: 1rem;">Remove Selected</button>
+				</div>
+			</form>
+		</div>
+		<script>
+		function toggleAll(checkbox) {
+			const checkboxes = document.querySelectorAll('.agent-checkbox');
+			checkboxes.forEach(cb => cb.checked = checkbox.checked);
+		}
+		</script>
+	}
+}