fix: Docker requires pre-built Linux binary (cannot cross-compile on Windows)

docker_install.v

@@ -50,21 +50,13 @@ state:
 		println('  Wrote: ${target_dir}/dashboard.html')
 	}
 
-	// Copy Dockerfile and build Linux binary
+	// Dockerfile for reference (binary must be built separately)
 	if os.exists('Dockerfile') {
 		os.cp('Dockerfile', '${target_dir}/Dockerfile') or {}
 		println('  Wrote: ${target_dir}/Dockerfile')
 	}
-	// Cross-compile Linux binary
-	println('  Building Linux binary (v -os linux)...')
-	build_result := os.execute('v -os linux -o ${target_dir}/ntfy-bridge .')
-	if build_result.exit_code != 0 {
-		println('  Warning: Could not cross-compile Linux binary.')
-		println('  ${build_result.output}')
-		println('  You will need a Linux binary named "ntfy-bridge" in ${target_dir}/')
-	} else {
-		println('  Built: ${target_dir}/ntfy-bridge')
-	}
+	println('  Note: Place a Linux binary named "ntfy-bridge" in ${target_dir}/ to build.')
+	println('  Build: v -os linux -o ${target_dir}/ntfy-bridge . (requires Linux or WSL)')
 
 	// docker-compose.yml
 	mut compose := 'services: