feat(api): add project-related API endpoints

Add API functions for project invitations and join operations.

src/client/api.ts

@@ -48,11 +48,19 @@ export const {
     projectRemoveMember,
     projectInvitations,
     projectInviteUser,
+    projectMyInvitations,
+    projectAcceptInvitation,
+    projectRejectInvitation,
     projectCancelInvitation,
     projectJoinSettings,
     projectUpdateJoinSettings,
     projectJoinRequests,
+    projectMyJoinRequests,
+    projectSubmitJoinRequest,
+    projectCancelJoinRequest,
     projectProcessJoinRequest,
+    projectJoinAnswers,
+    projectSubmitJoinAnswers,
     projectRolePriorities,
     projectUpsertRolePriority,
     projectDeleteRolePriority,
@@ -156,6 +164,8 @@ export const {
     categoryList,
     categoryCreate,
     participantList,
+    pinAdd,
+    pinRemove,
     pinList,
     threadList,
     threadCreate,