feat: update App routing and MeSidebar component

Add project routes to App, update MeSidebar with navigation
links to invitations and settings.

src/App.tsx

@@ -22,6 +22,7 @@ const TwoFactorPage = lazy(() => import("@/app/auth/two-factor").then(m => ({ de
 const VerifyEmailPage = lazy(() => import("@/app/auth/verify-email").then(m => ({ default: m.VerifyEmailPage })));
 const ChangePasswordPage = lazy(() => import("@/app/auth/change-password").then(m => ({ default: m.ChangePasswordPage })));
 const MePage = lazy(() => import("@/app/me").then(m => ({ default: m.MePage })));
+const MyInvitationsPage = lazy(() => import("@/app/me/MyInvitationsPage"));
 const ChatPage = lazy(() => import("@/app/chat").then(m => ({ default: m.ChatPage })));
 const ExplorePage = lazy(() => import("@/app/explore/ExplorePage").then(m => ({ default: m.ExplorePage })));
 const MyAccountPage = lazy(() => import("@/app/settings").then(m => ({ default: m.MyAccountPage })));
@@ -44,6 +45,8 @@ const CommitDetailPage = lazy(() => import("@/app/project").then(m => ({ default
 const IssueDetailPage = lazy(() => import("@/app/project").then(m => ({ default: m.IssueDetailPage })));
 const SkillDetailPage = lazy(() => import("@/app/project").then(m => ({ default: m.SkillDetailPage })));
 const PullRequestDetailPage = lazy(() => import("@/app/project").then(m => ({ default: m.PullRequestDetailPage })));
+const ProjectJoinPage = lazy(() => import("@/app/project").then(m => ({ default: m.ProjectJoinPage })));
+const ProjectInvitationPage = lazy(() => import("@/app/project").then(m => ({ default: m.ProjectInvitationPage })));
 const GeneralSettings = lazy(() => import("@/app/project").then(m => ({ default: m.GeneralSettings })));
 const MembersSettings = lazy(() => import("@/app/project").then(m => ({ default: m.MembersSettings })));
 const AccessSettings = lazy(() => import("@/app/project").then(m => ({ default: m.AccessSettings })));
@@ -96,6 +99,7 @@ export default function App() {
                 <Route path="/me/followers" element={<MePage />} />
                 <Route path="/me/following" element={<MePage />} />
                 <Route path="/me/notify" element={<MePage />} />
+                <Route path="/me/invitations" element={<MyInvitationsPage />} />
                 <Route path="/me/chat" element={<ChatPage scope="personal" />} />
                 <Route path="/me/chat/:conversationId" element={<ChatPage scope="personal" />} />
                 <Route path="/explore" element={<ExplorePage />} />
@@ -117,6 +121,9 @@ export default function App() {
                 {/* Channel-based routes if any */}
               </Route>
 
+              <Route path="/projects/:projectName/invitations" element={<ProjectInvitationPage />} />
+              <Route path="/:projectName/join" element={<ProjectJoinPage />} />
+
               <Route path="/:projectName" element={<ProjectLayout />}>
                 <Route index element={<Navigate to="repos" replace />} />
                 <Route path="repos" element={<ReposPage />} />

src/app/me/components/MeSidebar.tsx

@@ -8,6 +8,7 @@ import {
     Users,
     MessageSquare,
     Bell,
+    Mail,
     PanelLeftClose
 } from "lucide-react";
 import type { ComponentType } from "react";
@@ -53,6 +54,11 @@ const ME_NAV_ITEMS: NavItem[] = [
         name: "Notifications",
         icon: Bell,
     },
+    {
+        path: "/me/invitations",
+        name: "Invitations",
+        icon: Mail,
+    },
     {
         path: "/me/stars",
         name: "Stars",