feat: ConnectWise PSA integration (#106)

PSA abstraction layer with provider pattern, ConnectWise integration (connection management, ticket linking, note posting, status updates, member mapping), Integrations page UI, Fernet credential encryption, in-memory TTL cache, 6 DB migrations, ConnectWise API reference docs.

frontend/src/types/index.ts

@@ -89,3 +89,4 @@ export type {
 } from './kbAccelerator'
 
 export * from './scripts'
+export * from './integrations'

frontend/src/types/integrations.ts

@@ -0,0 +1,123 @@
+export interface PsaConnectionResponse {
+  id: string
+  account_id: string
+  provider: string
+  display_name: string
+  site_url: string
+  company_id: string
+  is_active: boolean
+  last_validated_at: string | null
+  created_at: string
+  updated_at: string
+  public_key_hint: string
+  private_key_hint: string
+}
+
+export interface PsaConnectionCreate {
+  provider: string
+  display_name: string
+  site_url: string
+  company_id: string
+  public_key: string
+  private_key: string
+}
+
+export interface PsaConnectionUpdate {
+  display_name?: string
+  site_url?: string
+  company_id?: string
+  public_key?: string
+  private_key?: string
+}
+
+export interface PsaConnectionTestResponse {
+  success: boolean
+  message: string
+  server_version: string | null
+}
+
+export interface PSATicketInfo {
+  id: string
+  summary: string
+  company_name: string | null
+  board_name: string | null
+  status_name: string | null
+  priority_name: string | null
+}
+
+export interface TicketLinkResponse {
+  session_id: string
+  psa_ticket_id: string | null
+  ticket: PSATicketInfo | null
+}
+
+export interface PSATicketSearchResult {
+  id: string
+  summary: string
+  company_name: string | null
+  board_name: string | null
+  status_name: string | null
+  priority_name: string | null
+  closed: boolean
+}
+
+export interface PSATicketStatusItem {
+  id: number
+  name: string
+  is_closed: boolean
+}
+
+export interface PsaPreviewResponse {
+  content: string
+  ticket: PSATicketSearchResult
+  available_statuses: PSATicketStatusItem[]
+  character_count: number
+  previous_posts: number
+}
+
+export interface PsaPostResponse {
+  id: string
+  session_id: string
+  ticket_id: string
+  note_type: string
+  status: string
+  external_note_id: string | null
+  error_message: string | null
+  status_changed_from: string | null
+  status_changed_to: string | null
+  posted_at: string
+}
+
+export interface PsaPostLogEntry {
+  id: string
+  ticket_id: string
+  note_type: string
+  status: string
+  error_message: string | null
+  status_changed_from: string | null
+  status_changed_to: string | null
+  posted_at: string
+  content_preview: string
+}
+
+export interface PsaMemberResponse {
+  id: string
+  identifier: string
+  name: string
+  email: string | null
+}
+
+export interface PsaMemberMappingResponse {
+  id: string
+  user_id: string
+  user_email: string
+  user_name: string
+  external_member_id: string
+  external_member_name: string
+  matched_by: string
+}
+
+export interface AutoMatchResult {
+  matched: PsaMemberMappingResponse[]
+  unmatched_users: number
+}

frontend/src/types/session.ts

@@ -64,6 +64,8 @@ export interface Session {
   assigned_to_id?: string | null
   batch_id?: string
   target_label?: string
+  psa_ticket_id?: string | null
+  psa_connection_id?: string | null
 }
 
 export interface SessionCreate {