fix: search API FTS join and error handling

Fixed 500 Internal Server Error in search API by correcting the FTS5
full-text search query join. The previous query incorrectly joined
fts.rowid directly to repositories.id, but FTS rowid corresponds to
the readmes table. Now properly joins through readmes table first.

Also enhanced error logging with detailed error messages in development
mode for easier debugging.

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

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

app/api/search/route.ts

@@ -40,8 +40,14 @@ export async function GET(request: NextRequest) {
     return NextResponse.json(results)
   } catch (error) {
     console.error('Search API error:', error)
+    const errorMessage = error instanceof Error ? error.message : 'Unknown error'
+    console.error('Error details:', errorMessage)
+
     return NextResponse.json(
-      { error: 'Internal server error' },
+      {
+        error: 'Internal server error',
+        ...(process.env.NODE_ENV === 'development' && { details: errorMessage })
+      },
       { status: 500 }
     )
   }

lib/db.ts

@@ -128,7 +128,8 @@ export function searchRepositories(options: SearchOptions): PaginatedResults<Sea
       fts.rank,
       snippet(readmes_fts, 2, '<mark>', '</mark>', '...', 32) as snippet
     FROM readmes_fts fts
-    JOIN repositories r ON fts.rowid = r.id
+    JOIN readmes rm ON fts.rowid = rm.rowid
+    JOIN repositories r ON rm.repository_id = r.id
     LEFT JOIN awesome_lists al ON r.awesome_list_id = al.id
     WHERE readmes_fts MATCH ?
   `