feat(psa): ticket queue dashboard with board selector and session auto-start

- Add PSABoard type + list_boards() to CW provider (cached 1h)
- Extend search_tickets with assigned_to_me, unassigned, board_ids, page, page_size
- New GET /integrations/psa/boards endpoint
- New TicketQueue dashboard component: My Tickets / Unassigned tabs,
  multi-select board filter, Load more pagination, Start Session per ticket
- Add TicketQueue to QuickStartPage after active sessions
- FlowPilotSessionPage auto-starts with ticket context when navigated
  from TicketQueue (psaTicketId + psaTicket in location.state)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/schemas/__init__.py

@@ -20,6 +20,7 @@ from .psa_connection import (
     PSATicketSearchResult, PSATicketStatusItem,
     PsaPostRequest, PsaPostResponse, PsaPreviewResponse, PsaPostLogResponse,
     PsaMemberMappingResponse, PsaMemberMappingSaveRequest, PsaMemberResponse, AutoMatchResult,
+    PSABoardResponse,
 )
 
 __all__ = [
@@ -50,4 +51,5 @@ __all__ = [
     "PSATicketSearchResult", "PSATicketStatusItem",
     "PsaPostRequest", "PsaPostResponse", "PsaPreviewResponse", "PsaPostLogResponse",
     "PsaMemberMappingResponse", "PsaMemberMappingSaveRequest", "PsaMemberResponse", "AutoMatchResult",
+    "PSABoardResponse",
 ]

backend/app/schemas/psa_connection.py

@@ -136,3 +136,8 @@ class PsaMemberResponse(BaseModel):
 class AutoMatchResult(BaseModel):
     matched: list[PsaMemberMappingResponse]
     unmatched_users: int
+
+
+class PSABoardResponse(BaseModel):
+    id: int
+    name: str