feat: Add 3dfilamentprofiles.com integration (Issue #7)

- Backend: Added ExternalSource enum, Filament3DFP model, and transform function
- Backend: Updated _sync() to fetch from both SpoolmanDB and 3dfilamentprofiles
- Frontend: Added source tabs to FilamentImportModal (All/SpoolmanDB/3DFP)
- Frontend: Updated ExternalFilament interface with source and temp range fields
- Frontend: Updated filament import handler to use temp range fields

Also includes:
- Dev mode styling (teal theme, DEV badge and banner)
- Translation keys for source filtering

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

client/src/pages/filaments/create.tsx

@@ -127,9 +127,9 @@ export const FilamentCreate: React.FC<IResourceComponentsProps & CreateOrClonePr
       multi_color_hexes: filament.color_hexes?.join(",") || undefined,
       multi_color_direction: filament.multi_color_direction,
       settings_extruder_temp_min: filament.extruder_temp || undefined,
-      settings_extruder_temp_max: filament.extruder_temp || undefined,
+      settings_extruder_temp_max: filament.extruder_temp_max || filament.extruder_temp || undefined,
       settings_bed_temp_min: filament.bed_temp || undefined,
-      settings_bed_temp_max: filament.bed_temp || undefined,
+      settings_bed_temp_max: filament.bed_temp_max || filament.bed_temp || undefined,
     });
   };