Fix Next.js 15 compatibility and TypeScript errors

- Update API route handlers to use async params for Next.js 15 compatibility
- Fix MUI DataGrid deprecated props (pageSize -> initialState.pagination)
- Replace Material-UI Grid components with Box for better compatibility
- Fix admin authentication system with proper request parameters
- Update permission constants to match available AdminPermission enum values
- Add missing properties to Page interface for type safety
- Update .gitignore to exclude venv/, import logs, and large data directories
- Optimize Next.js config to reduce memory usage during builds

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/admin/pages/page-editor.tsx

@@ -293,8 +293,8 @@ export function PageEditor({ open, onClose, page, onSave }: PageEditorProps) {
           {/* Content Tab */}
           {contentTab === 0 && (
             <Box>
-              <Grid container spacing={2}>
-                <Grid item xs={12} sm={8}>
+              <Box sx={{ display: 'flex', gap: 2, flexDirection: { xs: 'column', sm: 'row' } }}>
+                <Box sx={{ flex: { xs: '1', sm: '2' } }}>
                   <TextField
                     label="Page Title"
                     fullWidth
@@ -302,8 +302,8 @@ export function PageEditor({ open, onClose, page, onSave }: PageEditorProps) {
                     value={formData.title}
                     onChange={(e) => handleTitleChange(e.target.value)}
                   />
-                </Grid>
-                <Grid item xs={12} sm={4}>
+                </Box>
+                <Box sx={{ flex: '1' }}>
                   <FormControl fullWidth>
                     <InputLabel>Content Type</InputLabel>
                     <Select
@@ -316,8 +316,8 @@ export function PageEditor({ open, onClose, page, onSave }: PageEditorProps) {
                       <MenuItem value="MARKDOWN">Markdown</MenuItem>
                     </Select>
                   </FormControl>
-                </Grid>
-              </Grid>
+                </Box>
+              </Box>
 
               <TextField
                 label="URL Slug"
@@ -347,8 +347,8 @@ export function PageEditor({ open, onClose, page, onSave }: PageEditorProps) {
           {/* Settings Tab */}
           {contentTab === 1 && (
             <Box>
-              <Grid container spacing={3}>
-                <Grid item xs={12} sm={6}>
+              <Box sx={{ display: 'flex', gap: 3, flexDirection: { xs: 'column', sm: 'row' } }}>
+                <Box sx={{ flex: '1' }}>
                   <Paper sx={{ p: 2 }}>
                     <Typography variant="h6" gutterBottom>Publication</Typography>
                     <FormControl fullWidth sx={{ mb: 2 }}>
@@ -371,9 +371,9 @@ export function PageEditor({ open, onClose, page, onSave }: PageEditorProps) {
                       onChange={(e) => setFormData(prev => ({ ...prev, featuredImage: e.target.value }))}
                     />
                   </Paper>
-                </Grid>
+                </Box>
 
-                <Grid item xs={12} sm={6}>
+                <Box sx={{ flex: '1' }}>
                   <Paper sx={{ p: 2 }}>
                     <Typography variant="h6" gutterBottom>Display Options</Typography>
 
@@ -421,8 +421,8 @@ export function PageEditor({ open, onClose, page, onSave }: PageEditorProps) {
                       />
                     )}
                   </Paper>
-                </Grid>
-              </Grid>
+                </Box>
+              </Box>
             </Box>
           )}