Fix module import issue on fresh installs

- Added create_directories function to properly set up directory structure
- Added copy_module_files function to ensure JS modules are copied correctly
- Updated server.js to handle module imports more resiliently
- Fixed imports to work with both .js and no extension module references

🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>

server.js

@@ -15,9 +15,41 @@ const jwt = require('jsonwebtoken');
 const bcrypt = require('bcrypt');
 
 // Import custom modules
-const RssFeedManager = require('./modules/rss-feed-manager.js');
-const TransmissionClient = require('./modules/transmission-client.js');
-const PostProcessor = require('./modules/post-processor.js');
+// Try to import with .js extension first, then fallback to no extension for better compatibility
+let RssFeedManager, TransmissionClient, PostProcessor;
+
+try {
+  RssFeedManager = require('./modules/rss-feed-manager.js');
+} catch (e) {
+  try {
+    RssFeedManager = require('./modules/rss-feed-manager');
+  } catch (err) {
+    console.error('Failed to load RssFeedManager module:', err);
+    process.exit(1);
+  }
+}
+
+try {
+  TransmissionClient = require('./modules/transmission-client.js');
+} catch (e) {
+  try {
+    TransmissionClient = require('./modules/transmission-client');
+  } catch (err) {
+    console.error('Failed to load TransmissionClient module:', err);
+    process.exit(1);
+  }
+}
+
+try {
+  PostProcessor = require('./modules/post-processor.js');
+} catch (e) {
+  try {
+    PostProcessor = require('./modules/post-processor');
+  } catch (err) {
+    console.error('Failed to load PostProcessor module:', err);
+    process.exit(1);
+  }
+}
 
 // Constants and configuration
 const DEFAULT_CONFIG_PATH = '/etc/transmission-rss-manager/config.json';