Remove brand functionality and update Bambu Lab colors

- Remove brand field from entire codebase (frontend, backend, database)
- Update Bambu Lab colors to official list with correct hex values
- Clean up unused code and type definitions
- Add database migration to drop brand column
- Update search and filters to exclude brand references
- Ensure data persistence across all application layers

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

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

src/types/filament.ts

@@ -1,6 +1,5 @@
 export interface Filament {
   id?: string;
-  brand: string;
   tip: string;
   finish: string;
   boja: string;

src/types/filament.v2.ts

@@ -67,7 +67,6 @@ export interface FilamentV2 {
   id: string;
   
   // Product Info
-  brand: string;
   type: MaterialBase;
   material: Material;
   color: Color;