fix(09): resolve export data quality and integrate UI

backend/routers/admin/exports.py

@@ -5,7 +5,7 @@ Supports CSV and Excel formats.
 
 from datetime import datetime
 from fastapi import APIRouter, Depends, HTTPException, Query
-from fastapi.responses import FileResponse
+from fastapi.responses import StreamingResponse
 from sqlalchemy.orm import Session
 
 from backend.database import get_db
@@ -70,20 +70,16 @@ async def export_inventory_snapshot(
 
     # Return file response
     if format_type == "csv":
-        # For CSV, use FileResponse with bytes
-        import io
-        return FileResponse(
+        return StreamingResponse(
             io.BytesIO(content.encode("utf-8")),
             media_type=media_type,
-            filename=filename,
+            headers={"Content-Disposition": f"attachment; filename={filename}"}
         )
     else:
-        # For Excel, content is already bytes
-        import io
-        return FileResponse(
+        return StreamingResponse(
             io.BytesIO(content),
             media_type=media_type,
-            filename=filename,
+            headers={"Content-Disposition": f"attachment; filename={filename}"}
         )
 
 
@@ -126,22 +122,20 @@ async def export_audit_trail(
 
     # Return file response
     if format_type == "csv":
-        import io
-        return FileResponse(
+        return StreamingResponse(
             io.BytesIO(content.encode("utf-8")),
             media_type=media_type,
-            filename=filename,
+            headers={"Content-Disposition": f"attachment; filename={filename}"}
         )
     else:
-        import io
-        return FileResponse(
+        return StreamingResponse(
             io.BytesIO(content),
             media_type=media_type,
-            filename=filename,
+            headers={"Content-Disposition": f"attachment; filename={filename}"}
         )
 
 
-@router.get("/db/export")
+@router.get("/reports/export")
 async def export_db(
     format: str = Query("csv", description="Export format: csv or xlsx"),
     type: str = Query("inventory", description="Export type: inventory, audit, or combined"),
@@ -226,14 +220,14 @@ async def export_db(
 
     # Return file response
     if format_type == "csv":
-        return FileResponse(
+        return StreamingResponse(
             io.BytesIO(content.encode("utf-8")),
             media_type=media_type,
-            filename=filename,
+            headers={"Content-Disposition": f"attachment; filename={filename}"}
         )
     else:
-        return FileResponse(
+        return StreamingResponse(
             io.BytesIO(content),
             media_type=media_type,
-            filename=filename,
+            headers={"Content-Disposition": f"attachment; filename={filename}"}
         )