fix: fix Vue template parsing errors in ReadingProgress and TerminalHandsOn components

- Remove special characters from comment in ReadingProgress.vue
- Fix multi-line @click handler in TerminalHandsOn.vue
- Add simplified network components (NetworkLayersSimple, TcpUdpSimple)

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

docs/.vitepress/theme/components/appendix/terminal-intro/TerminalHandsOn.vue

@@ -69,12 +69,7 @@
                 <button
                   v-else-if="currentTask.expectedCmd"
                   class="copy-btn"
-                  @click="
-                    copyCommand(
-                      currentTask.expectedCmd[currentOS] ||
-                        currentTask.expectedCmd.common
-                    )
-                  "
+                  @click="copyCurrentTaskCommand"
                 >
                   复制命令
                 </button>
@@ -441,6 +436,11 @@ const copyCommand = (cmd) => {
   focusInput()
 }
 
+const copyCurrentTaskCommand = () => {
+  const cmd = currentTask.value.expectedCmd[currentOS.value] || currentTask.value.expectedCmd.common
+  copyCommand(cmd)
+}
+
 const focusInput = () => {
   if (cmdInput.value) {
     cmdInput.value.focus()