Refactor image processing and add image file serving functionality

- Updated image directory handling to prioritize mounted volume for persistence.
- Enhanced logging for directory write tests and fallback mechanisms.
- Introduced a new endpoint to serve image files directly from local paths.
- Added error handling for file serving, including checks for file existence and readability.
- Updated the frontend to include a new ContentView component and corresponding route.

frontend/src/pages/Writer/ContentView.tsx

@@ -0,0 +1,71 @@
+/**
+ * ContentView Page - Displays individual content using ContentViewTemplate
+ * Route: /writer/content/:id
+ */
+
+import { useState, useEffect } from 'react';
+import { useParams, useNavigate } from 'react-router';
+import ContentViewTemplate from '../../templates/ContentViewTemplate';
+import { fetchContentById, Content } from '../../services/api';
+import { useToast } from '../../components/ui/toast/ToastContainer';
+import PageMeta from '../../components/common/PageMeta';
+
+export default function ContentView() {
+  const { id } = useParams<{ id: string }>();
+  const navigate = useNavigate();
+  const toast = useToast();
+  
+  const [content, setContent] = useState<Content | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    const loadContent = async () => {
+      // Validate ID parameter - must be a number
+      if (!id) {
+        toast.error('Content ID is required');
+        navigate('/writer/content');
+        return;
+      }
+
+      const contentId = parseInt(id, 10);
+      if (isNaN(contentId) || contentId <= 0) {
+        toast.error('Invalid content ID');
+        navigate('/writer/content');
+        return;
+      }
+
+      setLoading(true);
+      try {
+        const data = await fetchContentById(contentId);
+        setContent(data);
+      } catch (error: any) {
+        console.error('Error loading content:', error);
+        toast.error(`Failed to load content: ${error.message || 'Unknown error'}`);
+        setContent(null);
+      } finally {
+        setLoading(false);
+      }
+    };
+
+    loadContent();
+  }, [id, navigate, toast]);
+
+  const handleBack = () => {
+    navigate('/writer/content');
+  };
+
+  return (
+    <>
+      <PageMeta 
+        title={content ? `${content.meta_title || content.title || `Content #${content.id}`} - IGNY8` : 'Content View - IGNY8'} 
+        description={content?.meta_description || 'View content details and metadata'} 
+      />
+      <ContentViewTemplate
+        content={content}
+        loading={loading}
+        onBack={handleBack}
+      />
+    </>
+  );
+}
+