Add technician login and dashboard pages

- Add /login page with dark theme matching portal
- Add /dashboard with 4 tabs: Support, Access, Build, Settings
- Add clean URL routes (/login, /dashboard) to server
- Add "Technician Login" link to portal footer
- Dashboard shows active support codes with generate/cancel
- Build tab has installer builder form (placeholder for agent)
- Access tab has 3-panel layout for machine management

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server/src/main.rs

@@ -82,6 +82,10 @@ async fn main() -> Result<()> {
         .route("/api/sessions", get(list_sessions))
         .route("/api/sessions/:id", get(get_session))
         
+        // HTML page routes (clean URLs)
+        .route("/login", get(serve_login))
+        .route("/dashboard", get(serve_dashboard))
+
         // State
         .with_state(state)
         
@@ -173,3 +177,18 @@ async fn get_session(
 
     Ok(Json(api::SessionInfo::from(session)))
 }
+
+// Static page handlers
+async fn serve_login() -> impl IntoResponse {
+    match tokio::fs::read_to_string("static/login.html").await {
+        Ok(content) => Html(content).into_response(),
+        Err(_) => (StatusCode::NOT_FOUND, "Page not found").into_response(),
+    }
+}
+
+async fn serve_dashboard() -> impl IntoResponse {
+    match tokio::fs::read_to_string("static/dashboard.html").await {
+        Ok(content) => Html(content).into_response(),
+        Err(_) => (StatusCode::NOT_FOUND, "Page not found").into_response(),
+    }
+}