Add real-time deployment updates and refactor JavaScript

- Add deploy stats (last deploy time, total count) to dashboard
- Add recent-deployments API endpoint for real-time updates
- Add live build logs to deployments history page
- Fix git clone regression (preserve entrypoint for simple clones)
- Refactor JavaScript into shared app.js with page init functions
- Deploy button disables immediately on click
- Auto-refresh deployment list and logs during builds
- Format JavaScript with Prettier (4-space indent)

internal/models/deployment.go

@@ -302,3 +302,24 @@ func LatestDeploymentForApp(
 
 	return deploy, nil
 }
+
+// CountDeploymentsByAppID returns the total number of deployments for an app.
+func CountDeploymentsByAppID(
+	ctx context.Context,
+	deployDB *database.Database,
+	appID string,
+) (int, error) {
+	var count int
+
+	row := deployDB.QueryRow(ctx,
+		"SELECT COUNT(*) FROM deployments WHERE app_id = ?",
+		appID,
+	)
+
+	err := row.Scan(&count)
+	if err != nil {
+		return 0, fmt.Errorf("counting deployments: %w", err)
+	}
+
+	return count, nil
+}