Remove 30 redundant function-level imports

These modules were already imported at the top of each file.
Removes re-imports of re, json, zipfile, and logging from
inside functions in archive.py, library.py, main.py,
printers.py, support.py, and test_library_api.py.

Resolves all 30 CodeQL py/repeated-import findings.

backend/app/api/routes/library.py

@@ -851,7 +851,6 @@ async def extract_zip_file(
         generate_stl_thumbnails: If True, generate thumbnails for STL files
     """
     import tempfile
-    import zipfile
 
     if not file.filename or not file.filename.lower().endswith(".zip"):
         raise HTTPException(status_code=400, detail="Only ZIP files are supported")
@@ -1313,8 +1312,6 @@ async def get_library_file_plates(
     and filament requirements. For single-plate exports, returns a single plate.
     """
     import json
-    import re
-    import zipfile
 
     import defusedxml.ElementTree as ET
 
@@ -1574,8 +1571,6 @@ async def get_library_file_plate_thumbnail(
     db: AsyncSession = Depends(get_db),
 ):
     """Get the thumbnail image for a specific plate from a library file."""
-    import zipfile
-
     from starlette.responses import Response
 
     result = await db.execute(select(LibraryFile).where(LibraryFile.id == file_id))
@@ -1616,8 +1611,6 @@ async def get_library_file_filament_requirements(
         file_id: The library file ID
         plate_id: Optional plate index to get filaments for a specific plate
     """
-    import zipfile
-
     import defusedxml.ElementTree as ET
 
     # Get the library file
@@ -1746,8 +1739,6 @@ async def print_library_file(
 
     Only sliced files (.gcode or .gcode.3mf) can be printed.
     """
-    import zipfile
-
     from backend.app.main import register_expected_print
     from backend.app.models.printer import Printer
     from backend.app.services.bambu_ftp import (
@@ -2188,8 +2179,6 @@ async def get_gcode(
         return FastAPIFileResponse(str(abs_path), media_type="text/plain")
     elif file.file_type == "3mf":
         # Extract gcode from 3mf
-        import zipfile
-
         try:
             with zipfile.ZipFile(str(abs_path), "r") as zf:
                 # Find gcode file

backend/app/api/routes/printers.py

@@ -852,7 +852,6 @@ async def get_printer_file_plates(
     """Get available plates from a multi-plate 3MF file stored on a printer."""
     import io
     import json
-    import zipfile
 
     import defusedxml.ElementTree as ET
 
@@ -1097,7 +1096,6 @@ async def get_printer_file_plate_thumbnail(
 ):
     """Get a plate thumbnail image from a printer-stored 3MF file."""
     import io
-    import zipfile
 
     result = await db.execute(select(Printer).where(Printer.id == printer_id))
     printer = result.scalar_one_or_none()
@@ -1594,8 +1592,6 @@ async def configure_ams_slot(
         kprofile_filament_id: K profile's filament_id for proper K profile linking
         k_value: Direct K value to set (0.0 to skip direct K value setting)
     """
-    import logging
-
     logger = logging.getLogger(__name__)
     logger.info("[configure_ams_slot] printer_id=%s, ams_id=%s, tray_id=%s", printer_id, ams_id, tray_id)
     logger.info(

backend/app/api/routes/support.py

@@ -413,8 +413,6 @@ async def _collect_support_info() -> dict:
 
 def _sanitize_log_content(content: str) -> str:
     """Remove sensitive data from log content."""
-    import re
-
     # Replace IP addresses with [IP]
     content = re.sub(r"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b", "[IP]", content)