feat: implement filament and spool preset services with CRUD operations

- Add `FilamentService` for managing filament inventory, including creation, retrieval, updating, and deletion of filaments.
- Introduce `SpoolPresetService` for handling spool presets, allowing users to create, update, and delete their custom presets.
- Create domain models for `Filament` and `SpoolPreset` with necessary fields and methods.
- Define repository interfaces for filament and spool preset persistence.
- Implement application configuration management from environment variables.
- Set up error handling with a centralized `AppError` type.
- Build the Axum router with public and protected routes for user authentication and resource management.

backend/bruno-routes/MewoSpool/Users/Get Me.yml

@@ -0,0 +1,17 @@
+info:
+  name: Get Me
+  type: http
+  seq: 1
+
+http:
+  method: GET
+  url: http://0.0.0.0:8080/api/v1/users/me
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5