Add meetings, sprints, and approval decision notes

Migration 042 creates meetings and sprints tables, adds decision_notes
to approvals. Full-stack: MeetingService, SprintService, IPC channels,
preload bridge, domain types. UI: MeetingsPage with scheduling and
type filtering, SprintsPage with progress tracking, ApprovalDetailDialog
with decision notes textarea.

AgentCompany-New/src/preload/index.ts

@@ -30,6 +30,10 @@ const api: DesktopApi = {
   createAutomationRule: (input) => invoke(IPC_CHANNELS.createAutomationRule, input),
   updateAutomationRule: (input) => invoke(IPC_CHANNELS.updateAutomationRule, input),
   deleteAutomationRule: (input) => invoke(IPC_CHANNELS.deleteAutomationRule, input),
+  createMeeting: (input) => invoke(IPC_CHANNELS.createMeeting, input),
+  deleteMeeting: (input) => invoke(IPC_CHANNELS.deleteMeeting, input),
+  createSprint: (input) => invoke(IPC_CHANNELS.createSprint, input),
+  deleteSprint: (input) => invoke(IPC_CHANNELS.deleteSprint, input),
   createApproval: (input) => invoke(IPC_CHANNELS.createApproval, input),
   decideApproval: (input) => invoke(IPC_CHANNELS.decideApproval, input),
   syncEmployeeIdentity: (input) => invoke(IPC_CHANNELS.syncEmployeeIdentity, input),