feat: add PSA context API client with TypeScript interfaces

Defines TicketDetails, CompanyInfo, ContactInfo, ConfigItemInfo,
TicketNote, RelatedTicket, and TicketContext interfaces matching backend
psa_context.py schemas. Exports psaContextApi with getTicketContext().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/api/psaContext.ts

@@ -0,0 +1,70 @@
+import { apiClient } from './client'
+
+// TypeScript interfaces matching backend Pydantic schemas in psa_context.py
+
+export interface TicketDetails {
+  id: number
+  summary: string
+  status: string
+  priority: string
+  board: string
+  sla: string | null
+  date_entered: string
+  resources: string | null
+}
+
+export interface CompanyInfo {
+  id: number
+  name: string
+  site: string | null
+  address: string | null
+  phone: string | null
+  type: string | null
+  territory: string | null
+}
+
+export interface ContactInfo {
+  name: string
+  email: string | null
+  phone: string | null
+  title: string | null
+}
+
+export interface ConfigItemInfo {
+  device_identifier: string
+  type: string | null
+  os_type: string | null
+  serial_number: string | null
+  ip_address: string | null
+  model_number: string | null
+}
+
+export interface TicketNote {
+  text: string
+  member: string | null
+  date_created: string
+  internal_analysis_flag: boolean
+}
+
+export interface RelatedTicket {
+  id: number
+  summary: string
+  status: string
+  priority: string
+  board: string
+}
+
+export interface TicketContext {
+  ticket: TicketDetails
+  company: CompanyInfo
+  contact: ContactInfo | null
+  configurations: ConfigItemInfo[]
+  notes: TicketNote[]
+  related_tickets: RelatedTicket[]
+  fetched_at: string
+}
+
+export const psaContextApi = {
+  getTicketContext: (ticketId: string | number): Promise<TicketContext> =>
+    apiClient.get<TicketContext>(`/integrations/psa/tickets/${ticketId}/context`).then(r => r.data),
+}