feat(admin): Add version API endpoint and refactor admin/moderation layouts

- Create new `/api/version` endpoint to retrieve git commit count and hash information
- Simplify admin page layout by removing unnecessary nested divs and card wrapper
- Refactor moderation page tab navigation with improved button styling using btn-sm and btn-primary classes
- Consolidate padding and styling in moderation page for cleaner component structure
- Add word-break and overflow-wrap styles to report content display for better text handling
- Improve responsive design by adding minWidth: 0 to flex containers in report cards
- Streamline conditional rendering in admin settings to reduce DOM nesting depth

src/app/admin/page.tsx

@@ -233,12 +233,10 @@ export default function AdminPage() {
                 <h1 style={{ fontSize: '18px', fontWeight: 600 }}>Admin Settings</h1>
             </header>
 
-            <div style={{ padding: '16px' }}>
-                <div className="card" style={{ padding: '24px' }}>
-                    {loading ? (
-                        <div style={{ padding: '48px', textAlign: 'center', color: 'var(--foreground-tertiary)' }}>Loading settings...</div>
-                    ) : (
-                        <div style={{ display: 'grid', gap: '16px', maxWidth: '600px' }}>
+            {loading ? (
+                <div style={{ padding: '48px', textAlign: 'center', color: 'var(--foreground-tertiary)' }}>Loading settings...</div>
+            ) : (
+                <div style={{ display: 'grid', gap: '16px', maxWidth: '600px', padding: '16px' }}>
                             <div>
                                 <label style={{ fontSize: '13px', fontWeight: 500, marginBottom: '4px', display: 'block' }}>Node Name</label>
                                 <input
@@ -532,8 +530,6 @@ export default function AdminPage() {
                             </div>
                         </div>
                     )}
-                </div>
-            </div>
         </>
     );
 }