feat: add GitHub integration page and sidebar item

- Add GitHub integration page at app/projects/[id]/github/page.tsx for repository management
- Add "GitHub Integration" item to project sidebar navigation
- Update homepage "Fullstack Agent" link to point to the GitHub repository

Author: Che-Zhu

app/projects/[id]/github/page.tsx

@@ -0,0 +1,184 @@
+'use client';
+
+import { useState } from 'react';
+import { ExternalLink, Github, Loader2, RefreshCw } from 'lucide-react';
+import { useParams, useRouter } from 'next/navigation';
+import { toast } from 'sonner';
+
+import { ConfigLayout } from '@/components/config/config-layout';
+import SettingsDialog from '@/components/dialog/settings-dialog';
+import { Button } from '@/components/ui/button';
+import { useProject } from '@/hooks/use-project';
+import { commitChanges, initializeRepo } from '@/lib/services/repoService';
+
+export default function GithubPage() {
+  const params = useParams();
+  const projectId = params.id as string;
+  const router = useRouter();
+
+  const { data: project, isLoading: projectLoading } = useProject(projectId);
+
+  const [isInitializing, setIsInitializing] = useState(false);
+  const [isCommitting, setIsCommitting] = useState(false);
+  const [showSettings, setShowSettings] = useState(false);
+
+  // Create a new repository on GitHub
+  const handleInitialize = async () => {
+    if (project?.githubRepo || isInitializing) return;
+
+    setIsInitializing(true);
+    try {
+      const result = await initializeRepo(projectId);
+      if (result.success) {
+        toast.success(result.message);
+        router.refresh();
+      } else {
+        if (result.code === 'GITHUB_NOT_BOUND') {
+          toast.error('Please connect your GitHub account first');
+          setShowSettings(true);
+        } else {
+          toast.error(result.message);
+        }
+      }
+    } catch (_error) {
+      toast.error('An unexpected error occurred');
+    } finally {
+      setIsInitializing(false);
+    }
+  };
+
+  // Commit changes to the repository and push to GitHub
+  const handleCommit = async () => {
+    if (isCommitting) return;
+
+    setIsCommitting(true);
+    try {
+      const result = await commitChanges(projectId);
+      if (result.success) {
+        toast.success(result.message);
+      } else {
+        if (result.code === 'GITHUB_NOT_BOUND') {
+          toast.error('Please connect your GitHub account first');
+          setShowSettings(true);
+        } else {
+          toast.error(result.message);
+        }
+      }
+    } catch (_error) {
+      toast.error('Failed to commit changes');
+    } finally {
+      setIsCommitting(false);
+    }
+  };
+
+  return (
+    <ConfigLayout
+      title="GitHub Integration"
+      description="Connect your project to GitHub for version control and collaboration"
+      loading={projectLoading}
+    >
+      <div className="max-w-3xl space-y-6">
+        {/* Connection Status Section */}
+        <div className="p-6 bg-[#252526]/50 border border-[#3e3e42] rounded-lg">
+          {/* Visual Header */}
+          <div className="flex items-start gap-5 mb-8">
+            <div className="p-3 bg-secondary/50 rounded-xl border border-border">
+              <Github className="w-8 h-8 text-foreground" />
+            </div>
+            <div className="space-y-1">
+              <h3 className="text-lg font-medium text-foreground">
+                {project?.githubRepo ? 'Connected to GitHub' : 'GitHub Repository'}
+              </h3>
+              <p className="text-sm text-muted-foreground leading-relaxed max-w-lg">
+                {project?.githubRepo
+                  ? 'Your project is currently active and synced with a remote GitHub repository. You can push your latest changes below.'
+                  : 'Initialize a new repository to start tracking changes. This will create a private repository in your GitHub account and push the initial code.'}
+              </p>
+            </div>
+          </div>
+
+          {/* Actions */}
+          <div className="pl-[76px]">
+            {project?.githubRepo ? (
+              <div className="space-y-6">
+                <div className="flex flex-col gap-2 p-3 bg-secondary/30 rounded-md border border-border/50">
+                  <span className="text-xs font-medium text-muted-foreground uppercase tracking-wider">Repository URL</span>
+                  <a
+                    href={project.githubRepo}
+                    target="_blank"
+                    rel="noopener noreferrer"
+                    className="flex items-center gap-2 hover:underline text-primary hover:text-primary-hover font-mono text-sm break-all"
+                  >
+                    {project.githubRepo}
+                    <ExternalLink className="w-3.5 h-3.5" />
+                  </a>
+                </div>
+                
+                <div className="flex items-center gap-3">
+                  <Button
+                    onClick={handleCommit}
+                    disabled={isCommitting}
+                    className="min-w-[140px]"
+                  >
+                    {isCommitting ? (
+                      <>
+                        <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+                        Pushing...
+                      </>
+                    ) : (
+                      <>
+                        <RefreshCw className="mr-2 h-4 w-4" />
+                        Push Changes
+                      </>
+                    )}
+                  </Button>
+                  <Button 
+                    variant="outline" 
+                    onClick={() => window.open(project.githubRepo!, '_blank')}
+                  >
+                    View on GitHub
+                  </Button>
+                </div>
+              </div>
+            ) : (
+              <Button
+                onClick={handleInitialize}
+                disabled={isInitializing}
+                size="lg"
+              >
+                {isInitializing ? (
+                  <>
+                    <Loader2 className="mr-2 h-5 w-5 animate-spin" />
+                    Creating Repository...
+                  </>
+                ) : (
+                  <>
+                    <Github className="mr-2 h-5 w-5" />
+                    Initialize & Push to GitHub
+                  </>
+                )}
+              </Button>
+            )}
+          </div>
+        </div>
+
+        {/* Global Settings Link */}
+        <div className="flex items-center justify-between p-4 bg-secondary/20 border border-border/50 rounded-lg">
+          <div className="space-y-1">
+            <h4 className="text-sm font-medium text-foreground">GitHub Account Settings</h4>
+            <p className="text-xs text-muted-foreground">Manage your global GitHub connection and personal access tokens.</p>
+          </div>
+          <Button variant="ghost" size="sm" onClick={() => setShowSettings(true)}>
+            Open Settings
+          </Button>
+        </div>
+
+        <SettingsDialog
+          open={showSettings}
+          onOpenChange={setShowSettings}
+          defaultTab="github"
+        />
+      </div>
+    </ConfigLayout>
+  );
+}

components/home-page.tsx

@@ -139,7 +139,7 @@ export function HomePage() {
             >
               {getButtonText()}
             </Button>
-            <Link href="https://fulling.ai/" target="_blank" rel="noopener">
+            <Link href="https://github.com/FullAgent/fulling" target="_blank" rel="noopener">
               <Button
                 size="lg"
                 variant="secondary"

components/sidebars/project-sidebar-new.tsx

@@ -7,6 +7,7 @@ import {
   ChevronRight,
   CreditCard,
   Database,
+  Github,
   Key,
   Package,
   Shield,
@@ -57,6 +58,12 @@ export default function ProjectSidebar({ project }: ProjectSidebarProps) {
       icon: CreditCard,
       href: `/projects/${project.id}/payment`,
     },
+    {
+      id: 'github',
+      label: 'GitHub Integration',
+      icon: Github,
+      href: `/projects/${project.id}/github`,
+    },
   ];
 
   return (