Add vue-router, login/setup flow and backend logging

Refactor frontend to route-based navigation with vue-router, add
system setup and login pages with API integration. Add structured
logging, access-log middleware and startup lifecycle to FastAPI
backend.

web/src/services/bootstrap.js

@@ -0,0 +1,78 @@
+const SETUP_API_BASE = '/__setup'
+
+function formatValidationErrors(detail) {
+  if (!Array.isArray(detail)) {
+    return ''
+  }
+
+  return detail
+    .map((item) => {
+      const field = Array.isArray(item.loc) ? item.loc[item.loc.length - 1] : 'field'
+      return `${field}: ${item.msg}`
+    })
+    .join('\n')
+}
+
+async function request(path, options = {}) {
+  let response
+
+  try {
+    response = await fetch(`${SETUP_API_BASE}${path}`, {
+      headers: {
+        'Content-Type': 'application/json',
+        ...(options.headers || {})
+      },
+      ...options
+    })
+  } catch {
+    throw new Error('无法连接初始化服务，请确认本地配置桥已启动。')
+  }
+
+  let data = null
+
+  try {
+    data = await response.json()
+  } catch {
+    data = null
+  }
+
+  if (!response.ok) {
+    const validationMessage = formatValidationErrors(data?.detail)
+    const message = validationMessage || data?.detail || '初始化请求失败，请稍后重试。'
+    throw new Error(message)
+  }
+
+  return data
+}
+
+export function fetchBootstrapState() {
+  return request('/bootstrap')
+}
+
+export function saveBootstrapConfig(payload) {
+  return request('/bootstrap', {
+    method: 'POST',
+    body: JSON.stringify(payload)
+  })
+}
+
+export function testBootstrapRuntime(payload) {
+  return request('/bootstrap/runtime', {
+    method: 'PUT',
+    body: JSON.stringify(payload)
+  })
+}
+
+export function testBootstrapDatabase(payload) {
+  return request('/bootstrap/database', {
+    method: 'PUT',
+    body: JSON.stringify(payload)
+  })
+}
+
+export function loginBootstrapAdmin(payload) {
+  return request('/auth/login', {
+    method: 'POST',
+    body: JSON.stringify(payload)
+  })
+}