refactor: 前端全面替换 any 为 unknown 并统一错误处理，后端用量记录补写请求头/体

- 前端 API 层、stores、conversation 解析器、组件全面替换 any 为 unknown/具体类型
- 错误处理统一使用 parseApiError/getErrorStatus 替代 err.response?.data?.detail 模式
- 后端 handler/TaskService/UsageLifecycle/StreamTracker 链路传递 request_headers/request_body
- streaming/pending 状态更新时可补写客户端和提供商的请求头及请求体
- 新增 TaskService 和 UsageService 相关测试

frontend/src/components/ui/avatar-image.vue

@@ -6,7 +6,7 @@ import { computed } from 'vue'
 interface Props {
   class?: string
   src?: string
-  alt: string
+  alt?: string
 }
 
 const props = withDefaults(defineProps<Props>(), {

frontend/src/components/ui/input.vue

@@ -76,6 +76,7 @@ const warnPasswordType = import.meta.env.DEV
       return () => {
         if (!warned) {
           warned = true
+          // eslint-disable-next-line no-console
           console.warn(
             '[Input] type="password" 已被弃用，请使用 masked 属性代替。\n' +
               '示例：<Input v-model="apiKey" masked />\n' +

frontend/src/components/ui/pagination.vue

@@ -94,7 +94,8 @@ interface Emits {
 const props = withDefaults(defineProps<Props>(), {
   pageSize: 20,
   pageSizeOptions: () => [10, 20, 50, 100],
-  showPageSizeSelector: true
+  showPageSizeSelector: true,
+  cacheKey: undefined
 })
 
 const emit = defineEmits<Emits>()

frontend/src/components/ui/popover/PopoverContent.vue

@@ -9,6 +9,7 @@ const props = withDefaults(defineProps<{
   sideOffset?: number
   alignOffset?: number
 }>(), {
+  class: undefined,
   align: 'center',
   side: 'bottom',
   sideOffset: 4,

frontend/src/components/ui/select.vue

@@ -15,8 +15,12 @@ interface Props {
 }
 
 const props = withDefaults(defineProps<Props>(), {
+  defaultValue: undefined,
   modelValue: undefined,
   open: undefined,
+  dir: undefined,
+  name: undefined,
+  autocomplete: undefined,
 })
 
 const emit = defineEmits<{