feat: 实现邮箱验证注册功能

添加完整的邮箱验证注册系统,包括验证码发送、验证和限流控制:
  - 新增邮箱验证服务模块(email_sender, email_template, email_verification)
  - 更新认证API支持邮箱验证注册流程
  - 添加注册对话框和验证码输入组件
  - 完善IP限流器支持邮箱验证场景
  - 修复前端类型定义问题,升级esbuild依赖

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

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

frontend/src/components/VerificationCodeInput.vue

@@ -0,0 +1,192 @@
+<template>
+  <div class="verification-code-input">
+    <div class="code-inputs flex gap-2">
+      <input
+        v-for="(digit, index) in digits"
+        :key="index"
+        :ref="(el) => (inputRefs[index] = el as HTMLInputElement)"
+        v-model="digits[index]"
+        type="text"
+        inputmode="numeric"
+        maxlength="1"
+        class="code-digit"
+        :class="{ error: hasError }"
+        @input="handleInput(index, $event)"
+        @keydown="handleKeyDown(index, $event)"
+        @paste="handlePaste"
+      >
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, watch } from 'vue'
+
+interface Props {
+  modelValue?: string
+  length?: number
+  hasError?: boolean
+}
+
+interface Emits {
+  (e: 'update:modelValue', value: string): void
+  (e: 'complete', value: string): void
+}
+
+const props = withDefaults(defineProps<Props>(), {
+  modelValue: '',
+  length: 6,
+  hasError: false
+})
+
+const emit = defineEmits<Emits>()
+
+const digits = ref<string[]>(Array(props.length).fill(''))
+const inputRefs = ref<HTMLInputElement[]>([])
+
+// Watch modelValue changes from parent
+watch(
+  () => props.modelValue,
+  (newValue) => {
+    if (newValue.length <= props.length) {
+      digits.value = newValue.split('').concat(Array(props.length - newValue.length).fill(''))
+    }
+  },
+  { immediate: true }
+)
+
+const updateValue = () => {
+  const value = digits.value.join('')
+  emit('update:modelValue', value)
+
+  // Emit complete event when all digits are filled
+  if (value.length === props.length && /^\d+$/.test(value)) {
+    emit('complete', value)
+  }
+}
+
+const handleInput = (index: number, event: Event) => {
+  const input = event.target as HTMLInputElement
+  const value = input.value
+
+  // Only allow digits
+  if (!/^\d*$/.test(value)) {
+    input.value = digits.value[index]
+    return
+  }
+
+  digits.value[index] = value
+
+  // Auto-focus next input
+  if (value && index < props.length - 1) {
+    inputRefs.value[index + 1]?.focus()
+  }
+
+  updateValue()
+}
+
+const handleKeyDown = (index: number, event: KeyboardEvent) => {
+  // Handle backspace
+  if (event.key === 'Backspace') {
+    if (!digits.value[index] && index > 0) {
+      // If current input is empty, move to previous and clear it
+      inputRefs.value[index - 1]?.focus()
+      digits.value[index - 1] = ''
+      updateValue()
+    } else {
+      // Clear current input
+      digits.value[index] = ''
+      updateValue()
+    }
+  }
+  // Handle arrow keys
+  else if (event.key === 'ArrowLeft' && index > 0) {
+    inputRefs.value[index - 1]?.focus()
+  } else if (event.key === 'ArrowRight' && index < props.length - 1) {
+    inputRefs.value[index + 1]?.focus()
+  }
+}
+
+const handlePaste = (event: ClipboardEvent) => {
+  event.preventDefault()
+  const pastedData = event.clipboardData?.getData('text') || ''
+  const cleanedData = pastedData.replace(/\D/g, '').slice(0, props.length)
+
+  if (cleanedData) {
+    digits.value = cleanedData.split('').concat(Array(props.length - cleanedData.length).fill(''))
+    updateValue()
+
+    // Focus the next empty input or the last input
+    const nextEmptyIndex = digits.value.findIndex((d) => !d)
+    const focusIndex = nextEmptyIndex >= 0 ? nextEmptyIndex : props.length - 1
+    inputRefs.value[focusIndex]?.focus()
+  }
+}
+
+// Expose method to clear inputs
+const clear = () => {
+  digits.value = Array(props.length).fill('')
+  inputRefs.value[0]?.focus()
+  updateValue()
+}
+
+// Expose method to focus first input
+const focus = () => {
+  inputRefs.value[0]?.focus()
+}
+
+defineExpose({
+  clear,
+  focus
+})
+</script>
+
+<style scoped>
+.code-inputs {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}
+
+.code-digit {
+  width: 3rem;
+  height: 3.5rem;
+  text-align: center;
+  font-size: 1.5rem;
+  font-weight: 600;
+  border: 2px solid hsl(var(--border));
+  border-radius: var(--radius);
+  background-color: hsl(var(--background));
+  color: hsl(var(--foreground));
+  transition: all 0.2s;
+}
+
+.code-digit:focus {
+  outline: none;
+  border-color: hsl(var(--primary));
+  box-shadow: 0 0 0 3px hsl(var(--primary) / 0.1);
+}
+
+.code-digit:hover:not(:focus) {
+  border-color: hsl(var(--primary) / 0.5);
+}
+
+.code-digit.error {
+  border-color: hsl(var(--destructive));
+}
+
+.code-digit.error:focus {
+  box-shadow: 0 0 0 3px hsl(var(--destructive) / 0.1);
+}
+
+/* Prevent spinner buttons on number inputs */
+.code-digit::-webkit-outer-spin-button,
+.code-digit::-webkit-inner-spin-button {
+  -webkit-appearance: none;
+  margin: 0;
+}
+
+.code-digit[type='number'] {
+  -moz-appearance: textfield;
+}
+</style>