Remove 3dfilamentprofiles integration (Issue #7)

3dfilamentprofiles.com has Vercel bot protection blocking automated requests.
Their GitHub repo only has sample data (~3 filaments).
SpoolmanDB already has 6,957+ filaments, making this unnecessary.

Removed:
- spoolman/externaldb.py: ExternalSource enum, Filament3DFP model, 3dfp sync
- client/src/utils/queryExternalDB.ts: ExternalSource enum, source field
- client/src/components/filamentImportModal.tsx: Source filter tabs

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

client/src/utils/queryExternalDB.ts

@@ -22,11 +22,6 @@ export enum Pattern {
   SPARKLE = "sparkle",
 }
 
-export enum ExternalSource {
-  SPOOLMANDB = "spoolmandb",
-  FILAMENT_PROFILES_3D = "3dfilamentprofiles",
-}
-
 export interface ExternalFilament {
   id: string;
   manufacturer: string;
@@ -48,7 +43,6 @@ export interface ExternalFilament {
   pattern?: Pattern;
   translucent: boolean;
   glow: boolean;
-  source?: ExternalSource;
 }
 
 export interface ExternalMaterial {