Fix getActive API to use standardized response format

- Update /api/getActive to return { success: true, data: {...} } format
- Add proper error handling with standardized error responses
- Update main page to handle new response format for active sources
- Remove unused variables and clean up code
- Add trim() to file reads to handle whitespace properly

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

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

app/page.tsx

@@ -81,7 +81,7 @@ export default function Home() {
       ]);
       
       setStreams(streamsData.data);
-      setActiveSources(activeData);
+      setActiveSources(activeData.data);
     } catch (error) {
       console.error('Error fetching data:', error);
       showError('Failed to Load Data', 'Could not fetch streams. Please refresh the page.');