feat(observabilidade): UI lista de sessões com filtros

src/lib/api/sessions.ts

@@ -0,0 +1,36 @@
+import type { SessionMeta, SessionEvent } from '../../../api/types/session'
+
+export interface ListParams {
+  days?: number
+  project?: string
+  tool?: string
+  skill?: string
+  q?: string
+  limit?: number
+  offset?: number
+}
+
+export interface ListResponse {
+  total: number
+  items: SessionMeta[]
+}
+
+const API_BASE = import.meta.env.VITE_API_BASE ?? ''
+
+function buildQuery(params: Record<string, unknown>): string {
+  const entries = Object.entries(params).filter(([, v]) => v !== undefined && v !== '' && v !== null)
+  if (entries.length === 0) return ''
+  return '?' + new URLSearchParams(entries as [string, string][]).toString()
+}
+
+export async function listSessions(params: ListParams): Promise<ListResponse> {
+  const res = await fetch(`${API_BASE}/api/sessions${buildQuery(params as Record<string, unknown>)}`)
+  if (!res.ok) throw new Error(`listSessions failed: ${res.status}`)
+  return res.json()
+}
+
+export async function getSession(id: string): Promise<{ meta: SessionMeta; events: SessionEvent[] }> {
+  const res = await fetch(`${API_BASE}/api/sessions/${encodeURIComponent(id)}`)
+  if (!res.ok) throw new Error(`getSession failed: ${res.status}`)
+  return res.json()
+}